It's just from a local toy shop. Bar the really rare stuff, there isn't much that isn't available at the hundreds of toy shops here. It's just that they are all in Kowloon and I have to change trains to get there which is slightly inconvenient.
I don't mind telling you the prices of how much I paid for all 3 sets.
D304 an D305 individual boxes = HKD$4000
D306 (first set, C9 box, no flap crease, complete paperworks) = HKD$3600
D306 (second set, C8.5 box, toys never transformed, but no paperworks) = HKD$3800
hahaha... i literally went through constant rain to get them. I was actually hunting for Henkei Rodimus today though.