gs430wannabe

I'm going to buy a used ('01 or '02) GS 430 in the near future. I'm curious what other folks experience has been relative to pricing. It seems that while blue book for what I want is about $39,700, prices are in the mid forties. I don't know if these things are typically sensitive to geogrpahy, but I live in the Washington, D.C. area. Is this typical or have I just not found the right dealers/sellers yet? Would welcome any insights. Thanks Bob Swartz rws28@comcast.net