Someone asked a while ago about tapping threads for their vanagon. I have the
40 piece set from Harbor Freight and have been pleased with the quality and
variety. So far they have been good enough for cleaning threads and the
occasional new hole. Hard to go wrong for $10. They have some pricier ones that may
serve some of you better.

http://order.harborfreight.com/EasyAsk/harborfreight/results.jsp