IMHO if your car is in reasonably good mech and cosmetic condition you should have no problem selling it yourself...plenty of people looking for "affordable" X5's
Check the Craigs listings and Autotrader

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BMWCCA # 12660
14 GLK 350 M/B (hatefull POS gone)
05 CLK 500 AMG Cabrio
07 530xiT
09 Boxster