OK this is what I have and how much I would let them go for, right now. The last one in the list is a part of my own setup, however if the price is right I'd definitely let it go.
040@25Mhz - 603e@240Mhz - with SCSI and cable - $350USD
060@50Mhz - 603e@240Mhz - no SCSI - $400USD
060@50Mhz - 603e@240Mhz - with SCSI and cable - $500USD