The big block has been dropped. Supposedly because of emission issues. Fun bike to ride once in awile but far from practical. IMO The trike is also a blast to ride.
Mountain Boss Hoss In Somerset, Pa.. still builds big blocks and they go from $65-110,000.. They are the premier Boss Hoss dealer.
The best part of a Boss Hoss is the sound they make on startup. Everyone looks. They are definitely a conversation piece.
A friend bought an 08 small block last October from Mountain and basically the way the bikes/trikes come from the factory are junk. They (MBH) buy them unpainted, modify the fuel tanks in the front so the wiring isn't exposed, chrome the wheels, put metal fenders on (instead of plastic), etc, etc..
When you get a Hoss from them or Lima Boss Hoss in Ohio, you have something special as they are not created equal.