I have collected more cabs than I need. So, I have
Two Euphonic Audio CXL12s. One has the slot to fit the iAmp 800 to make a killer combo. That one also has casters and a handle on the back to roll it. One cover. $300 each
Acme Low B2 Series II: just recently had new woofers installed and the whole thing gone over by Andy Lewis. $325
15 Thiele cabinet from the EV TL606 plans. This is made with 3/4 baltic birch by a carpenter student of mine. It's been toured a lot, so the natural finish has some signs of use, but it's a tank. It has very nice large casters and has a Eminence 3015 neo driver. Very good old school 15 tone. $275, which these days is barely more than the driver.
http://www.usspeaker.com/Kappa%20Lite-3015-1.htm I'd prefer a Colorado sale (and would meet halfway), but if someone wants to pay shipping, I'm happy to talk!