Sorry - just posting because I am chuffed to finally see something that wasn't asking the usual "collectable" price tag on Trademe.
I just grabbed a 48k ZX Spectrum off Trademe for $10 (Buy Now price, surprisingly). The description said that it didn't work and that its the keyboard membrane. There was mention that the seller has no idea if there's any issues with the internals and its not tested, but I'll definitely annoy you all for advice if there is I'm sure. I have no idea how to fix these things, but I know the expertise is here. Lets hope its only the membrane that's the issue - and I'll be double-chuffed that it only cost $10.
Anyway, that's my happy rant of the week so apologies for the post - and the fact I've never contemplated grabbing any more stuff and expected to live with my childhood hoard under the house. Roll on my current possibly-from-hoarding-to-cheap-collecting midlife crisis.