Today I'm gonna do that thing where I go to the warehouse club and buy $200 worth of groceries, then come home and chop half of the vegetables for freezing. My eyes are burning from the onions.
The rest I use fresh, but we can't go through three pounds of carrots before they go bad, so I keep a stock of diced carrots in the freezer and throw them in to soups, stews, and stir-fries. I did the carrots, onions, and mushrooms tonight. The celery will have to wait 'til tomorrow.
You might not think mushrooms freeze well, and actually, they don't, but I blend ground beef with finely minced white mushrooms to use in lasagna and spaghetti bolognese; it cuts the fat and calories considerably, and nobody notices unless I tell them. When they're being sauteed, you can get away with using frozen -- and I think frozen retains its texture better than canned.
I also bought a 10-lb bag of individually frozen (not wrapped) chicken breasts. Gotta love the warehouse club.