I only started collecting at the beginning of 2010- I got most of Henkei at close to retail prices from RK- that was based on the stock they had available at the time. Henkei Ratchet was available for a while which I got 1 for about 30ish. But there was no ironhide. At the time I did not value henkei ironhide as I do now...
As for rarity of henkei figs in general- I think they all shot up in value towards latter half of last year as:
-regular retailers dried up in stock,
-the demand increased as generations/united was announced/released
-Prevalence of 3rd party releases last year compared to previous.
Now if you found one whilst hunting in hk... id be interested![]()