I got a nice one off E-bay 12" wheels Electra Bekum BAS 315. There were quite a few on there, I bid for a couple near me, once they'd gone the price seemed to come down as no one wants to travel miles or pay for postage. I stuck in a winning maximum bid of £170 with 30 seconds left on the auction and I got it at £130 I gave the bloke "20 to deliver it as he had a van
I spent a bit of time and £10 cleaning/tuning it.
Del
PS.Just noticed, mine is the same as Coopers, a few posts up, the manufacturer changed name a few times and was bought out by Metabo eventually. Spares are still available easy and cheap on the internet