Buying canned tomatoes in bulk

After spending approximately $10 to make a lasagna, I knew I needed a less costly option to making tomato sauce. My grocery store sells cans of crushed tomatoes (slightly under 2 lbs) for $1.81. This price has always seemed steep, but I hadn't found a cheaper option. Until last weekend. Then I found a 10 lb. can of crushed tomatoes at Costco for under $3.
What a deal! But what to do with 10 lbs? I decided to spend the entire afternoon making a huge vat of tomato sauce. There was so much sauce that it started bubbling out of the crockpot.

In all, this 10 lb can made about 4 meals worth of sauce. 3 of the 4 were frozen.

At last! A cheaper way to make one of my favorite food items (I'm known to eat it straight out of the pot).

For more kitchen kips, go here, for money saving ideas, go here.

Edited to add recipe:
Cook 2-3 onions (diced) and chopped garlic (lots) in oil until slightly brown
Add 10 pound can of crushed tomatoes
Add 2 small cans of tomato paste
Add frozen cubes of carrots, spinach, etc
Sprinkle in a generous amount of salt, pepper, dried basil, dried oregano, garlic powder
Let simmer on low heat or in a crock pot for 20 minutes--several hours (depending on when dinner is to be served!)