Yes, you can save money by buying in bulk. But, and I must say BUT!!! You have to store things properly and you have to be able to keep track of when things expire so they can be used up and rotated forward in your pantry or storage area. AND you have to know your prices!! Just because a store sells in bulk does not mean it’s cheaper. You have to divide out your total cost into cost per serving or cost per ounce and compare with smaller packaged items and other stores.
I seriously doubt that buying premade products in bulk will save you much money in the long run. A 10 lb bag of frozen chicken nuggets might cost 3 cents cheaper per serving than a 2 lb bag. But cutting up chicken (that you bought on sale) into bite size boneless pieces of meat, dipping them in milk, flour, milk again, and then cornflake or bread crumbs will ALWAYS be cheaper than buying the premade ones.
Buying in bulk, to me, means the basics should be bought in bulk. Things like flour, sugar, tea, coffee, dry beans, etc. Educate yourself on where these things are cheapest (comparison shopping is the only way to know for sure and be sure to include shipping vs. fuel for driving into your calculation).
Also- Educate yourself on how to store them long term so that they don’t spoil and critters can’t break in! Make a system of some kind to help you know when the stuff stored in the basement or long term storage needs to be brought to the kitchen for use and replaced in the basement with new product. A good source for this kind of information is http://www.millenium-ark.net