You can also go directly to LaMotte. The advantage is reagents will be fresh, reagents for all tests are available, and you can order larger size bottles that will save $. The downside is if you don't place a minimum order of of ($50? I think) you pay a heavy handling charge.
http://www.lamotte.com/pages/aqua/index.html Somewhere on the site is access to xls price list. If you don't find it let me know and I will email one to you. Or you could email LaMotte for a price list. Now that I think about it the price list might not be on the site. I ordered small bottles once before an operator told me I could get mega ounces for the same price as the two puny ounces bottles I was ordering.
I didn't see the shipping charges on the siite Jay L. mentioned, but chances are good that would be a better deal for smaller quantities. I was a avid tester for a while. About a year ago bought a big time supply of reagents and have tested maybe a half dozen times since - figures.
Jay Reeves