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GMpartsdirect.com for OEM parts. If one can find said part with an ACDelco label (along with the eight digit OEM #), you'll be getting the same part from the dealership but from a distributor which is much less money. Rock Auto was mentioned, but I've found Amazon to be even cheaper.
Here's my first stop when I need to do any work: http://parts-catalog.acdelco.com/catalog/catalog_search.php
edit: here's a good example -- 12608580 timing chain tensioner...
ACDelco (which is the OEM part) Amazon: $33.25 shipped or Rock Auto: $39.33 shipped
Dealership retail: $53.44
GMPartsDirect: $43.26 shipped
Here's my first stop when I need to do any work: http://parts-catalog.acdelco.com/catalog/catalog_search.php
edit: here's a good example -- 12608580 timing chain tensioner...
ACDelco (which is the OEM part) Amazon: $33.25 shipped or Rock Auto: $39.33 shipped
Dealership retail: $53.44
GMPartsDirect: $43.26 shipped