Why not a decent price drop on 7800gtx lines?

[videopho]

I'd expect at least a 15-20% price drops accross all 7800gt/gtx lines from on-line retailers since the x1900xt lines released last week. It does not seem to be happenning from what I've seen. Is it a slow occurence and taking its time? Or retailers just won't budge?
I ended buying a used gtx from another AT mate with much better price and on the verge of buying another gtx from another mate.

 

[rise]

if supply and demand don't change, neither will the $$.