Ah. You might ask around on reefcentral to see if there's a store that other reefers in your area trust. If not then just go ahead and go the RO/DI route and go with any of the major brands of salt. Salt is one of those areas that opinions differ greatly on. I've only used Kent, and Crystal Seas salts. I won't use Kent again, I seemed to have a lot more algae issues when I was using it. Lots of folks like oceanic, and it seems to be in most of the stores around me. I'd take a look at your LFS and see what brands are readily available, and then post which ones you're thinking of using.
B