Saltpeter - where can i get it in SD?
You used to be able to get it at drug stores. 40 years ago pharmacists had it behind the counter. You did not need an Rx, but you had to be over 18 to get it due to its explosive nature (not in the sense of the above comments). With pharmacies doing less compounding these days, I could not even guess if they stock it anymore.
I've used the Morton's Tender Quick a few times and it's worked well for me on bacon and corned beef. Iowa Meat Farms used to carry sodium nitrate (or is it nitrite?) but I guess they started getting questioned from the FBI since it's one of the primary ingredients in bomb making. If I'm correct (and I hope I am), with the Morton's Tender Quick stuff, the sodium nitrate/nitrite is already premixed with salt so you don't need to dilute it down with more salt (just whatever herbs/spices/flavorings you're going to use).
Iowa Meat Farms
6041 Mission Gorge Rd, San Diego, CA 92120