Here's a set with only two sizes for about $205 plus shipping. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=360130607303
These folks say they have the best prices, and so far best I've found. If you ask they should offer the larger set with all the SAE sizes up to 3/8", and you could add the 1/2" size if needed.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-