If you're not in any hurry & don't mind used, another option is eBay Motors. That's where I got mine (also happens to be the '92 FSM) for about half the price. What I do is develop a search string that I think will produce the greatest number of most relevant results, bookmark it & then every 3 days or so do a check of what's available. 3 days bc that's the shortest auction length I've noticed. Here's an example of the search string I might've used in my search:
dodge manual (factory,service) (truck,"pick-up","pick up",w250,"w-250",w350,"w-350") ("'91",1991,"'92",1992,"'93,1993)
You can copy & paste it to the Search box on eBay Motors then select "in titles & descriptions" & click "Search". What I like to do, Once the results come up, is then sort by "Price". To do that, just click on the "Price" column heading. Just tried the search string & came up with one possibility:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2438417681&category=34218
Once I've found a potential buy I look at the # of transactions the seller has done, which is right next to the seller's ID in parentheses -- the higher the better. Then look for amount of "Positive feedback" -- I prefer 95%+. I then look at shipping costs. Everything checks for the item above.
The best way I've found to bid on an item is to record the auction's expiration date & time & then, if possible, 10 or so minutes before auction expiration put in a proxy bid for the maximum amount I'd be willing to spend. The reason I do that is to see how high bidding has gone. If the high bid isn't that much more than my "willing to spend" # I'll bump it up a bit & submit it.
Also, should mention, that some items up for auction have a "Buy It Now" option.
Another option if you don't want to wait, & one I've used to buy other manuals, is Amazon.com's used books section. Just do a search on "Books" & then look for used versions.
Good luck.