GM is following Chrysler and Ford by introducing new rebates designed to increase sales. The moves comes as GM reported a drop of nearly 20 percent in October sales. GM added $1000 rebates through Nov 13 on remaining 2005′s but the offer doesn’t extend to Corvette. The lack of rebates for Corvette is a good sign though as 2005 inventories are low enough as to not worry the GM bean-counters. No word yet if any rebates will be extended to 2006 models.