Look, there are only three "preban" parts that the majority of AR owners would be concerned about; threaded barrels, flash suppressors, and collapsible buttstocks.
Barrels have always been the same prices, whether threaded or not, GI type flash suppressors have always been a $5 piece, so what could they go up to, $7.50? Collapsible stocks (non Colt) have actually been going down in price recently..
The only overpriced AR stuff I see out there are the aftermarket add ons that all the mall ninjas love; because 25 Special Forces guys in Iraq bought them once so these stayathomes just have to have one. They've always been grossly overpriced, and I expect will stay so.
If anyone is going to bump prices after next month, it might be some greedy shops bumping their prices for threading barrel ends for flash suppressors; but I really don't expect a whole lot of that either