The power tool companies dont buy the RC specific cells, those are the only ones that Trinity distributes.
To buy non RC specific Sanyo and Panasonic cells just go to any battery distributer.
There are some very interesting "power tool cells" out there that are very close to the RC specific cells but they are in plain shrink and aren't ROAR legal. I have a couple practice packs of N1900SCR, they are very close to the RC2000 cells. Sanyo also makes a CP2400 cell that is pretty close to the RC2400.