You can get street versions as grey market imports from the Orient. You only have to find the right connections and means to have them shipped, otherwise they are too expensive to get. NS250 MC28 average 8K, MC21 6K There are still loopholes to get them titled and licensed. Fun bikes to ride though
Honda sells it's RS250R brand new for I wanna say $15k, check the HRC website, last I checked it said they had none currently available. But oh man would that be sweet, 110+ rwhp and only 200lbs :drool Also the RS125R is like $10k, these prices might be slightly off though.