I found a seller on eBay that offers a few sets of metric and SAE thread chaser/rethreading taps. They are USA-made and under $20 plus shipping. I bought a metric set a while ago and just bought a SAE set to chase the threads on my intake manifold bolt holes. I thought some of you might be interested.
http://www.ebay.com/itm/140904791538?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
http://www.ebay.com/itm/140904791538?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649