There was no single price drop. Prices have been fluctuating a lot. Right now, prices aren't too dissimilar from prices 1.5-2 years ago. $70 on eBay would be the average going price, and people pay too much for parts on there...
Regardless, you're right. $80 is probably too high. I'd keep it and see if DDR3 prices go back up.
Edited by onoz - 7/20/11 at 8:49am