We have Costco and Sams Club, A Large family we make the dollar go further buying in Bulk, each have items that the other doesn't carry, example we buy Pork Loins at Sams, Costco doesn't carry that size and we cut our own Pork Chops out of it,(8 meals we Seal a meal) Chicken is cheaper at Costco, Other Frozen Items are carried exclusively at one or the other. Beef is usually farm bought. We have 2 Fridges and 1 Freezer and a Generator to prevent Power Failure waste. Depending on what you prefer any of the 3 are good options vs Local Supermarkets.
http://www.stilltasty.com/ is a good site to figure out storage length, Frozen is good longer just with some quality loss but safe. Canned good vary between Dollar store and depending who has what on sale. Healthy snacks Costco, Candy for events like what you could get at 7-11 are at Sams. so depending on your taste either are good bets for bulk, you can always find local sales that beat any of them.