I know its not the right section but I found all of these at my Toyworld two weeks ago.

Powercore 2 Packs
2-packs (US$10 - AU$18)
- - Wave 4 (Dec) OUT
Heavy Tread w/ Groundspike (New Autobot)
Skyhammer w/ Airlift (New Decep)
- - Wave 5 (Feb) OUT
Salvage w/ Bomb-Burst (redeco Auto)
Undertow w/ Waterlog (New Decep)