But the 3 1/2 diskdrive needs to be like one of those you need for an Amiga, so it's quite difficult to get :/
Anyway, Spectrum +3s are non-existant here in Argentina, I imported mine from the UK. I bought it for something like 10 UK quid! Go to ebay and look for one, you can find shitloads
I bought mine without PSU though, but I was very lucky to find a seller with a spare +3 PSU to sell!