Epson CP/M Laptop

<Quick question, what is a fair price to offer someone for a nicely decked <out CP/M laptop? It's the one that has a bunch of the software on two <ROMS, and IIRC has a tape recorder. It has modem, doc's and some other <stuff. I'd like to offer the guy a fair price instead of getting a good <deal. I presume it's a PX-8 Geneva. Ok the options are various utilities in roms that appear to the system like CPM disk drives. Also there are wedges that screw on to the back, those are a modem/60k ram disk, a utility unit and a 120k ramdisk. DOCs can be anything but the more the better. I ahve one it's a good unit. The common problem is dead nicads of which there can be three of them (one in the wedge, two different one in the main unit). I paid 75$ for mine a bunch of years ago, they are a workhorse unit. Allison