I bought mine over time on ebay. I found a cheap used set of flank drives and then found the sizes the seller did not have. Now I have 5/16-1" set (including 11/32) for about $150 when all said and done.
Now I'm doing the same thing on the SO LTA 'low torque' series open end wrenches.
If a company you order from operates business in the state you are located in (no matter where in the state), you are required to pay sales tax. It does not matter that the parts could come from all across the country.
I just got these white handle Snap On screwdrivers today for $50 shipped. Missing one from the set but thats no biggie. Will work out just fine at work. :thumbup: