I've been watching the cost of mining hardware on E-bay, just for fun.
BFL Little Singles (30 GH/s) are down from about 1100-ish to 900 -ish. (original retail $649)
Biggest drop seems to be the Singles (60 GH/s units), list price at $2499, in hand units are not even going for current retail price.
As for ASICMiner stuff, blades use to go for $3000-ish, now down to $300-ish.
Bitfury starter kits at about $1100ish.
Block erupter USBs for $17 bucks and change.
I'm predicting a HUGE drop in mining gear prices, once people realize that it's not worth it to buy anything at 250 million difficulty, and climbing.
The bus has left the building. Unless you have half a terahash mining tomorrow morning or right now, you ain't making squat.
Of course, some people do not really care, and they are securing the network, making a little on the side. Nothing wrong with that either.
The network self-regulates itself. It's a beautiful thing.