I purchase all my supplements and healthy snacks (dark chocolate, organic nuts etc) online either through iHerb.com, I have some coupon codes (updated monthly) here that you can save money if you were to buy online too.
iHerb Discount & Coupon Code: ZIM276
You can enter the above coupon code during checkout and it will save you 5%. You can get this discount even if you are not the first-time buying from iHerb!