Hey Darth, I actually ended up getting it working again but am still looking for a spare. I don't know how long this one will last and would like to have a backup if something goes wrong. I found a small amount of oxidisation(?) on some of the CPU pins, and after giving them a gentle brush it worked again after re-seating the CPU.
I'll definitely let you know if I find some! Thank you so much for the offer, I'd assume postage to New Zealand (if that's something you could be bothered with) would be ridiculous? The prices seem to be getting crazy with our dollar value dropping.