I have a brand new in the box Hughes Performance Full Manual Trans Brake (Part # HP2215) for a TH400 which can be seen here:
http://www.summitracing.com/parts/HUP-HP2215/
I paid $414.95 + shipping for this sucker, build is going a different direction and I will be using my TH350 instead.
I am asking $300 but I'm open to trades for retrofit SBC/BBC roller lifters (solid or hydraulic), TH350 reverse manual valve body, TH350 shift kit, TH350 nitrous converter (between 2,500-3,500 advertised stall), 4wd TH350 with transfer case output on driver's side, nitrous purge kit, aftermarket fbody wheels, drag radials, or the following parts for a 1969 camaro - weather stripping, black interior carpet/headliner, bumpers, etc. Basically LMK what you have if it's related to a SBC/BBC/TH350 or 1st gen f body.
Also have a TH400 (short tail/2wd) that needs to be rebuilt. Looking for $100 for that.