Wanted cheapo 26" rear MTB wheel

[wheeliebin]

Does anyone have a 26" MTB rear wheel they's be willing to part with for not much money? Needs to fit a 7 or 8 speed cassette and rim brakes. It's for el cheapo bike that's outside during the day so as long as it's basically round and functional. I've already bought 2 new wheels for that bike (one was nicked, the other bent beyond repair by scumbags). Somewhere within reasonable pick up distance of Welwyn in Herts, it might not be worth posting anything.

Thanks