Some of the more expensive items in Japan as they compare to the three Haslab toys (prices mostly from the TTM site so that we have a more uniform comparison than going by AU prices (that are never reliably converted) or US prices, because almost all expensive Hasbro toys were released in Japan)...
- (Gen1) Unicron (new - same as Hasbro version) w/ Autobot Shuttle, Galvatron, Hotrod - MARCH 27th 2021 (77,000yen)
- Transformers Victory Saber (Hasbro Crowd Funding Project) (Star Saber, Victory Leo, Holi, Fire) - End 2022 (26,950yen)
- Generations Deathsaurus (Hasbro Crowd Funding Project) - End 2023 (29,700yen)
(ones in BOLD were more expensive than Victory Saber, at retail in Japan)
2023
- MP-57 - Skyfire (new) (TakaraTomyMall exclusive) - Late JAN (38,500yen)
- MPM-10R - Starscream Revenge Vers. (late February 2023 - 24,200yen)
2022
- MPM-13 - Decepticon Blackout & Scorponok (new) - Late DEC (26,400yen)
- KD EX-09 - Autobot Ark (TITAN - same as Hasbro version?) (TakaraTomyMall exclusive) - Late March (was December) (30,800yen)
- TL-14 - Metroplex (TITAN - same as Hasbro version?) - Late DEC (33,000yen)
- Black Zarak (TITAN - redeco/remould Scorponok) (TakaraTomyMall exclusive) - Late March (30,800yen)
2021
- MP-52 - Starscream v2 (new mould) - Late JUNE (30,800yen)
- MP-52+ - Thundercracker v2 (redeco MP-52 Starscream) (TakaraTomyMall exclusive) - Late SEPT (27,500yen)
- MP52+SW - Skywarp Vers 2 (redeco Starscream) (TakaraTomyMall exclusive) - Late DEC (27,500yen)
- Volcanicus (minor redeco & minor remould - Grimlock, Sludge, Snarl, Slug/Slag, Swoop) (TakaraTomyMall exclusive) - Late FEB 2021 (22,000yen)
- Abominus (minor redeco & minor remould - Hungrrr, Sinnertwin, Blot, Cutthroat, Rippersnapper) (TakaraTomyMall exclusive) - APR 17th (22,000yen)
2020
- MP-10DC - Convoy Duck Camo vers - (camo redeco) - MARCH 26th - (19,000yen)
- MP-49 - Black Convoy (black redeco MP-44 Optimus Ver 3 - cab only) - JULY 25th (23,000yen)
- MP-50 - Tigatron (new) - SEPT 26th (26,400yen)
- MPM-10 - (Movie) Starscream (same as Hasbro version?) - LATE OCT (22,000yen)
- Seacons God Neptune (TakaraTomyMall Excl) - Late OCT (22,000yen)
- ER-10 - Scorponok (Titan - same as Hasbro version?) - NOV 30th (27,500yen)
(Studio Series Devastator not released as a boxset in Japan - it was same price as Legacy Metroplex in Australia ($340), so could have been about 33,000yen if TT had released it)
2019
- MP-10ASL - Convoy Atmos Safari Lebron version (yellow/orange redeco Cab only - Atmos exclusive) - MARCH 3rd - (22,000yen)
- MP-43 - Beast Wars Megatron - MARCH 30th (was JAN 26th) - (37,000yen)
- MP-44 - Convoy Ver 3 (new - cab & trailer) - AUG 31st - (50,000yen)
- SG-39 - Omega Supreme (Titan - same as Hasbro version?) - DEC 26th (25,000yen)
- UW-04 - Devastator (Unite Warriors reissue - TakaraTomyMall exclusive) - Late JAN (27,000)
(one expensive non-TakaraTomy item this year is the 2019 MP-10 Ghostbusters Optimus which was us$150, which is the US Titan price point, so about 25,000yen)
2018
- MP-711 - Optimus Prime (white/green redeco - 7-11 Japan exclusive) - (27,000yen)
- MP-41 - Dinobot (Beast Wars) (new) - (25,000yen)
- MP-36+ - Megatron (Toy Edition) (minor redeco - TakaraTomyMall exclusive) - (26,000yen)
- LG-EX - Grand Maximus (redeco Fortress Maximus) (TakaraTomyMall excl & Asia) - (27,000yen)
- PP-31 - Predaking (Titan - 5 Predacons (Razorclaw, Rampage, Divebomb, Headstrong, Torox) - same as Hasbro version) - (25,000yen)
- Car Robots - God Fire Convoy (reissue - minor redeco) - (27,000yen)
- TakaraTomyMall - LG-EX - Metroplex w/ Scamper (reissue) - (27,000yen)
2017
- LG-43 - Dinosaurer (Titans Return Trypticon - same as Hasbro version) (23,000yen)
- MP-10 - Convoy (reissue) (23,760yen)
(it is worth noting that combiner sets were under 17,000yen before 2018, which is why only the re-released ones were listed above, as the prices went way up)
2016
- LG-31 - Fortress Maximus (Titans Return Titan w/ sword) (25,000yen)
(one expensive non-TakaraTomy item this year is the 2016 SDCC Fortress Maximus at us$180, which is double Legacy Motormaster (us$90 - 15,400yen), so would have been about 30,800yen)
2015
(one expensive non-TakaraTomy item this year is the 2015 SDCC Devastator at us$180, which is double Legacy Motormaster (us$90 - 15,400yen), making it about 30,800yen)
2014
(one expensive non-TakaraTomy item this year is the 2014 SDCC Knights of Unicron rockband at us$185, which is similar to 2015 Devastator, to be about 31,000yen)
(one expensive non-TakaraTomy item this year is the 2014 SDCC Dinobot set at us$160, which is double Kingdom Rodimus (us$80 - 14,300yen), making it about 29,000yen)
2013
TG23 - Metroplex w/ Scamper (20,000yen)
(one expensive non-TakaraTomy item this year is the 2014 SDCC Metroplex at us$150, which was the price of Titan Fort Max in 2016, which was 25,000yen)
2011
- - MP-10 Convoy (Optimus Prime) (Vers 2) (new - Auto) 23,000yen
(that might be the earliest official Transformers toy that was more than 20,000yen)
Just as one final note, I think it is worth mentioning that if you ignore the multi-packs because each toy is actually cheaper (which would also rule out Haslab Victory Saber), these are probably the most expensive *single figure* toys from Hasbro & TakaraTomy, from most expensive first...
1 - (Gen1) Unicron (new - same as Hasbro version) - (77,000yen)
2 - MP-44 - Convoy Ver 3 (new - cab & trailer) - (50,000yen)
3 - MP-57 - Skyfire (new) (TakaraTomyMall exclusive) - (38,500yen)
4 - MP-43 - Beast Wars Megatron - (37,000yen)
5 - TL-14 - Metroplex (TITAN - same as Hasbro version?) - (33,000yen)
=6 - KD EX-09 - Autobot Ark (TITAN - same as Hasbro version?) (TakaraTomyMall exclusive) - (30,800yen) (*maybe not count as it is kinda 2 bots)
=6 - Black Zarak (TITAN - redeco/remould Scorponok) (TakaraTomyMall exclusive) - (30,800yen)
=6 - (2016 SDCC Fortress Maximus at us$180, which is double Legacy Motormaster (us$90 - 15,400yen), so would have been about 30,800yen)
=6 - MP-52 - Starscream v2 (new mould) - (30,800yen)
10 - Generations Deathsaurus (Hasbro Crowd Funding Project) - (29,700yen)
(yeah... this wasted a few hours today, as I really got into finding out the most expensive items released so far)