I have the following Factory Service Manuals up for sale on eBay:

76 Chevette: eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
84 Camaro: eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
98 Venture/Trans Sport/Silhouette: eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
98 Venture/Trans Sport/Silhouette update book only: eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
04 Astro/Safari: eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
04 GM Unit Repair (trans/driveline/axle, all makes): eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

I hope this is of interest!