Google it, I just received one I skeptically ordered for NINTY-NINE CENTS, plus $3.99 shipping, it is like brand new. 87-93, not even a finger print on a page.
list here to choose from:
The download is the official service manual not the less-helpful Chilton or Haynes. But the download is for 1991 (so applicable to B2200 and B2600i, not so applicable for engine and transmission for your B2600). So you may do better with both.