The only ITG Auto set I've ever tried putting together is 11-12 Between The Pipes (still working on it) and while it's a very different set (goalies, lots more 'active' guys, and some very cheap to buy prospects) I would imagine the deal with SPs holds true from one of their sets to the next:
When they call it an SP, it's almost always goingt to be hard to find.
I'm still missing 11 cards for that set - and it's a not a matter of not wanting to pay a fair price for the card.... I simply can't find copies of them. 4 of them are not even marked as SPs, yet there doesn't seem to be any available?
In the case of Enforcers - when you're dealing with ultra popular guys like Probert & Howe, putting them into a set that's going to have a few very dedicated set builders (not to mentioned player collectors wanting those cards) it doesn't surprise me, at all, that those cards would go for big money.
Has anyone even seen a copy of the Hanson triple ?