should be with the rest of the test kits, and it should just say "phosphate" test kit. If you don't see it, they probably don't carry it. My LFS (*****) only carries a few test kits, and they didn't include phosphates. You could order one offline, or travel a bit farther to another LFS, or see if your LFS can order one for you. Best to go with Salifert brand. Don't get Red Sea brand, as their tests have been known to be off...