I just got off the phone with Adventure Accessories / Lynch HUMMER. They were very helpful and offer GM parts at fair prices. I'll either install myself or find someone handy. I ordered the following:
<UL TYPE=SQUARE> <LI>Roof Racks <LI>Mud Flaps <LI>Rigid Tire Cover <LI>Gas Cap <LI>Mudder Floor Mats[/list]
Ordered the HUMMER letters and Stainless Steel bumper inserts from eBay. That should hook the HUMMER pretty well.
Still not pleased with the dealer. Even with installation, those prices are high.