We have personally tested and gotten feedback on hundreds of products, brands, and formulas and from thousands of customers with digestive disorders. We do not recommend saving $5 by getting them from Wal-Mart, etc. We can't tell you why one brand works well and another gives little or no benefit. We can tell you that within a reasonable price point, these are the most effective products we know of. We do not recommend or carry any brand's "full line" of products. While we welcome you to buy wherever you like, we do strongly recommend sticking to these exact items, formulas, and brands. If you think we are being self-serving, simply buy the exact items/brands elsewhere and you will see that we have done our research and you will benefit either way.