For those in the market, I just noticed 2 F2-B's and an F1-X no Ebay.  One of the F2-B's is represented as having been purchased from Billy Sheehan.  Seems to me I've seen this unit advertised by someone saying they'd bought from Sheehan some months back.  Might be worth enquiring about if interested in this unit.

Another F1-X just turned up on Ebay.