PDP-8e question

A local electronics surplus store that I have frequented for years is going out of business next week (sigh). During this week's visit, the proprietor offered me a pallet of 10 'complete, working and loaded' PDP 8e's. When I asked what he wanted for them, his response was the typical 'make me an offer'. I got the feeling that if I passed, they'd end up on ePay. My collection is mostly 80s-era 8-bit micros (Apple, Commodore, etc), and Heathkit test kits; the only piece of DEC-ware I currently have is VAXstation 3100, so I have no idea what the PDPs are worth. If I take these things off his hands, what would be a fair offer? Cosmetically, they seem to be in great shape, and he powered a couple of them up for me (blinkenlights and such). I opened several of them up, and they were all filled with various cards. Space considerations probably will only allow me to keep two or three; I'll offer the rest here - whatever doesn't get claimed will be put on ePay. - Mike