Replacing "Belt Moulding" on 2004 Vibe Pass Rear Door

[ReconJarhead]

I lost the belt moulding on my 04 Vibe to the car wash several weeks ago and didn't think much about it. Just a $20-30 piece right? Wrong. Am at the GM dealer now, they say $320 for a piece of plastic 2 ft long-ridiculous. Does anyone know where you can purchase this piece of plastic at a "reasonable" price? THanks Matt