where can i find good used dell inspion 8000/8100 lcd srcreens real cheep

$395.00 that not what i refer to as cheap .lol
http://www.impactcomputers.com/8040y.html

You need to dig a little bit to found what you need, big stores has a lot to do regarding prices actualizations. Make a search not based in Part Number but in Part Description and you will find better prices.
On top of that, you can use the OEM numbers at the back of the LCD and lower the prices.
Using the phone, you can get better deals also, specially if those guys stock large amount of merchandise because they have not actualized prices.
Price is more a matter of negotiation than browsing...