NC REDBIRD-----Best way to find current prices is to go to ebay and search for your machines under "advanced search" (see next to the search box and click on that. Then choose "completed listings" after you enter your machine model. You will get the prices paid and pictures and information that the seller posted. You can figure out that if you sell them locally you can get more or less what they are going for on ebay. (You cannot just do a regular search on ebay, cause there are crazy people who list a rusted hunk of a machine for twice the price of a nice clean running machine. Their machines never sell!)
(Prices vary by location, also. I got three machines in the back hills of PA for total of $25. Never see deals like around my area.)