id say your cheapest option is to find a turbo from a local scrappies.... just exchange the whole unit.
beware tho, cos you may end up with just the same problem if not straight away then not too far into the future. depends what state the replacement turbo is in.
ive not had to encounter a turbo change up to now so i dont know what the score is with reconditioned or new ones.
good luck with it tho dude!!