Bulk potassium and strontium supplements

I'm looking for cheaper options. You can buy a lb of KNO3 for only $3. The problem is I already have a decent amount of nitrates, so I would like to stay away from that if I can.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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