I have a very nice Carvin B1500 in 4 space SKB rack for sale. I purchased it a little over a year ago from another TBer and have used it on 50-60 gigs. Really a fantastic amp. Great warm tone and TONS of headroom. Will run at 8, 4 or 2 ohms. It has pretty much been racked it's whole life and is i would say 9/10 cosmetically. There is one screw missing on the top access panel of the amp. Other than that it looks pretty close to brand new. Amp is in perfect working order.
B1500 Shipped in SKB rack $425
I would also be willing to work out a trade for either a GK MB500 or a US MB800 with foot switch.