There is a B flat recorder, the Kung Folklora. I've tried one, it was crap.

What I'd like is an A flat recorder - that would be ideal for playing tunes in two or three flats with a two-octave range from B flat (which is quite a lot of Scottish tunes from around 1800, Marshall wrote oodles of them). They do exist as A=460 renaissance G altos, or else in baroque design to special order. Either way, far too expensive.