I seem to recall that there is a Teensy-based USB converter for the protocol if you want to use it with a modern PC. They are well made but not exactly compact.
A recent group buy on Deskthority charged 20 EUR for a keyboard in good condition, 15 for more yellowed / written-on keyboards and 10 EUR for some that were missing parts.
Look out - there are also later models that almost the same as the Cherry MX-based ones but are rubber domes and with incompatible key caps. I think these have stepped Caps Lock where the upper portion is 1.5× wide. Note that there are also Cherry MX-based Wyse PCE keyboards with black legends, or all-white keys with purple legends.
If you strip the keyboard, please do also salvage the Cherry-style stabilisers!