I see rack versions being offered for the same price as the keyboard version, which, in my opinion, is a rip-off. That's $2,000 or slightly more. I think a fair price for a PEK in excellent condition would be $2,000, and for a PER, $1,500. Anything substantially higher than that would be unreasonable. Still, I've seen a PEK on Ebay for $3,000, and a MEK for about $2,100. Ridiculous.