firstly, your fault doesnt sound like a blown turbo so DONT buy anything without a diagnosis.

second, a rebuild on those turbos isnt actually very expensive i had one done on my MR2. plus theyre ceramic as standard and the chances of an original 2nd hand one still being in good nick after this long are a long shot as theyre not very strong.

honestly mate, get problem diagnosed then IF it needs a turbo just get a rebuild from a proper turbo company like CR Turbos and you'll be sorted.