You may want to try online atwww.autotrader.com or search for some nline VW clubs and get the word out that way. Unfortunately we haven't found any VW-only sites for selling cars but you might also try www.ebaymotors.com, where there are a lot of people looking for specific things.
You might also look into using a car broker (ie: www.Carmax.com or www.AutoNation.com). The other idea would be to check out your local authorized ASE certified repair center to ask for any recommendations they might have of clients who are intrested. It might be a good time to get a pre-sale inspection done to ease a buyer's mind!
You can search for a local ASE certified repair shop here: