Here's a listing on Audiogon for a pair of Raven 350s for $6500. Stated as new and closeout with a 1 year warranty. I asked public questions if the original 10 year warranty is transferable, and that I thought these were only available as direct to consumer from the bobcarvercorp.com web site. I just asked a few minutes ago, so no response. The seller is in California,
https://www.audiogon.com/listings/lisb881g-bob-carver-350-mono-amps-tube