you can't do that, even u sub lease, if some thing goes wrong with this car, u will take full responsibilities. not the guy who sub lease from u. if the car gone..u pay fully price..u have no control of this, unless the dealer find u one sublease.
By the way, your title (M3只卖18000了) of this BBS is misleading people here.
it is not Beamer M3 sell for 18000 bucks. u just simply want some one take over ur lease and looks like u haven't give any break on the deal.