LDS Cannery
I am LDS and just wanted to give you a brief description of how our canneries work. These canneries are available throughout the US and maybe even in Mexico, likely in Canada. Our church teaches that we should have a 3-6 mth supply of everyday items, and a 1 yr supply of life sustaining staples, and this is their way of helping make that possible. You call ahead to the cannery to find out when they are open and to make an appt. Items (wheat, powdered milk, oats, and a variety of other dry goods) are available in bulk bags. You can buy them straight off the shelf during hours that the cannery is open. If you want to just have the bags of items, you can walk in, pick them up and pay. As mentioned before, occasionally demand outpaces supply and they run out of items. They should have a good idea of when they will restock. If you know exactly what you want, you may want to call a day or two before your appt and make sure that they still have it.
If you are wanting items in number 10 cans, you will have to can it yourself. They have all of the equipment there and will train you and often help. It is good to take two or more people to make it go a bit more quickly. If you want 5 cans of wheat and a bag will fill 8 cans, they ask that you can all 8 cans (use up the bag) and the ones that you don't want to purchase will go on a shelf for anyone who wants to buy them. This means that sometimes when you just want a can or two of something (carrot dices, onion flakes, etc), you might find it on the shelf left from an order that someone previously canned.
You can buy foods by the can, or in bulk and purchase the cans, o2 absorbers, mylar bags, bulk food separately. They also have mylar sealers, so if you prefer to store in mylar bags, you can do that. They do allow you to also check out the canners and mylar sealers (not sure if they allow non-lds, but it doesn't hurt to ask) so that you can do stuff at home. This is nice for people who coupon and might get deals on sugar, flour, or those who like to seal 72 hr kits or other safety gear in a can or mylar bag to protect it. I would recommend using the equipment in the cannery first before you try to take it home and use it. Also, they have a factsheet about food safety, what you can safely store and how long it lasts under what conditions.
All of the above information applies to what they call dry-pack canning, which most every cannery is. The LDS church also operates wet-pack canneries in certain areas. Depending on the area and the growing season, they can produce from local church owned farms to distribute to the needy. You may be able to buy canned peaches, beans, salsa, and other produce based goods if you live near a wet-pack cannery and are willing to volunteer to work a shift.
To locate a cannery in your area go to the aforementioned
http://www.providentliving.org click on home storage, then click on the locations link at the top of the page.
The website also has a list of items available for dry-pack, plus a ton of other great food storage and preparedness info, a basic food calculator (how much food for X number of people for X number of months). Overall a great website for people who want to be ready for just about anything life can throw at them! I know this is long, and a bit old, but I hope it helps!!