I'm a big model builder. The old Chevy trucks in our years are usually pretty expensive for a nice clean kit. The 72 Fleetside LWB and the 72 stepside have been repopped several times and are fairly easy to find, the fleet more than the step (GMC). All others, good luck. I have been trying to get my hands on a nice 68 LWB, but they have been out of my price range. A quick look through ebay only lists this 69 Blazer and a set of instructions for a 69, the one with the fire truck option. (Not my auction)
http://www.ebay.com/itm/AMT-Ertl-196...item27c0660821