Used parts are all over the board depending on your source. If you hoof it through the salvage yards you can find deals but not always. There's
www.craigslist.com and
www.ebay.com and
http://www.copartfinder.com/finder/searchMake.do and
www.car-part.com and even our forum has a classified ads section.
I'm looking for a good set of OEM blue mats, blue dash, and inner trunk fascia/molding.
Anyhow, here's the lows and highs I've seen on some parts:
Driver's under dash fascia - $20 to $60
Heritage Medallion - $3 to $30
Chrome wheels - $300 to $2000
Steering wheel - $5 to $20
Rocker Panels - $5 to $100
Door Panel - $25
Sunroof glass - $12.50 to $150
Drivers Door Controls - $5 to $90
Homelink rolling code - $2.50 to $40
Homelink nonrolling code - $2.50 to $25
A/C controls - $15 to $60
9C1 Sway bars (set) $20 to $100