The front-wheel-drive 2006 Chevrolet HHR wagon, a late-to-the-market competitor to the Chrysler PT Cruiser, will start at $15,990 including shipping. A base 2006 Chrysler PT Cruiser, which gets mild midcycle revisions this year, starts at $14,850, including shipping. The HHR has an on-sale date of mid-October. Chevrolet plans to roll out the new wagon on the East and West Coasts first with nationwide deliveries anticipated by mid-December. The wagon^s national ad campaign will kick off September 5.