worth 5-10 dollars ea
variances in price can be for the folloeing reasons

cracked screens
no stands

if you can do any soldering there is good monry to be made in repairs. Lots of time it is blown capicator and only a .50 cent part. I have a shop here who repairs the nicer lookong ones for a 10 dollar fee and resell for 40-60 ea. Good working units with cracked screens you can tear apart and sell power supply and main board on ebay for decent money.

if you are in the Ohio area AIM (affinity information management) is a good source to sell these.