I love Ken's for not only food but other supplies as well. I use his cichlid flake and soft & moist sinking pellets with spirulina as my staple foods for all my tanks. I have also used his earthworm flakes and some of the floating pellets. All of it is good quality at reasonable prices.
His prices are competative on filters, media, and air pumps as well. Definitely my internet supplier of choice.