I was just searching yesterday and found so many cheap 5-series. Check it out.
http://www.autotrader.com/fyc/vdp.js...standard=false
http://www.autotrader.com/fyc/vdp.js...standard=false
There's tons for sale under $37,000 and even the 550i you can find under $40,000
http://www.autotrader.com/fyc/vdp.js...standard=false
I don't know if these are base models (don't know much about the 5 series) but they seem ridiculously cheap to me. Anyone else?