Im on a trip right now and would need my gmt900 shop manual (have the printed gm manuals at home in my garage). So i thought "lets buy an online version". Not so easy, some dealers just send out dvds, others offer downloads. The ones with downloads i would need, but they all look a little bit shady ;)

Is there a good source to buy these gm manuals online, including download version?

helm publications,on-line is expensive