I hope this doesn't break any rules, but I figured since wagons are always wanted I'd share my recent search of E91s that are for sale. A few of which seem like great deals. Maybe this could be the go-to thread of wagons for sale or something...
2007 328xi | 45,596 miles | AWD | 6-speed MT | $15,000
http://www.autotrader.com/cars-for-s...32839368&Log=0
2009 328i xDrive | 79,814 | AWD | 6-speed MT | $18,995
http://www.autotrader.com/cars-for-s...32857139&Log=0
2009 328i | 79,000 | RWD | 6-speed MT | $12,995
http://www.autotrader.com/cars-for-s...33356339&Log=0