I had a couple of Acorn Electrons I picked up from a church fete (seriously) many years ago. I gave them away a while later, because I didn't really have a use for them, but I regret it now as I've got back into retro 8-bit computers recently, having got a modern C64 remake and a refurbed ZX Spectrum 48k rubber key version. I even got a tape loader emulator for the Speccy which means I can experience the proper loading sequence (with the exception of R tape loading error).
I also just bought from Ebay a refurbished ZX81 which has a modern ULA, High res mode, 32k ram, composite mod, and new power regulator, as my current, battered one is faulty (needs a new keyboard, and a composite mod).
I've been trying to get a decent quality one for weeks - even a faulty one to use to refurb my old one, but the good ones are selling for more than I'd want to pay, as I'd have to get them fixed up and modded anyway so there'd be extra costs on top.
The one I bought was more expensive than I really wished to pay, but it doesn't need anything doing to it to use, plus it plays the Hires games which I never tried back in the day.
I also managed to pick up a Memopak16k RAM pack just for nostalgia's sake, as that was the one I had for my ZX81, back in 1982.