I dont know about crystal or whatever that uses, but i know that cortexes and controllers go for like 250 these days. If i were you, i’d put it up for like $700, bring it down if you don’t get any buyers.
The radio is not VEXnet compatible. Its not a Cortex brain and as far as I remember is is not programable. Its pretty much a nice clawbot(*) You wont get $700 from someone that knows VEX parts. You should look at the cost of a protobot kit and go from there.