You've got MidwayUSA, Sportsman's Warehouse, Reed's Ammunition and Research, etc., etc., etc., etc. Getting the ammo you want is no real problem. Shop around, do a little surfing, and find the best price. You pay shipping, but no sales tax. I try to buy by the case.
I still think you should buy the 21 if you like the looks. It's pretty classy (w/o the TR logo of course).