Either online or in pharmacies. If you're finding it hard to get "injectable saline" without a prescription, don't sweat it. Brands have to go through an expensive endotoxin test to have that "injectable" label, and many just won't do it. As long as it's sterile and preservative-free, you'll be fine. If you want to be sure you're getting good saline, you can order twelve 10ml bottles from us for $35.