Shouldn't be hard to find. Check RV Trader, I am sure there will several options of both new and pre-owned units.
Going to take a pretty good size tow vehicle for the double slide bunk houses, but I am sure you are well aware.
We recently looked at this floorplan in several manufactuers and modesl and went with a JayFlight 29QBH (no bunk slide) simply becasue it was about 3'shorter and little lighter. I didn't see any double slide bunk house I would be comfortable towing with anything less than a 250/2500.
2007 Chevy Duramax LMM/Allison
2012 Jay Flight 29QBH
2012 Jay Flight 26BH (Sold)