San Diego Health Stores

I am a Canadian who will be visiting this city and would love to know if anybody buys their post surgery bariatric shakes, powders etc from a local store and if so which one? The shipping cost to Canada is either excessive or not even an option so while Im there, Id like to stock up. Any information you can give me would be very much appreciated!

I buy my Whey powder at COSTO which is a membership store. I also buy boxed protenn shakes there.