I take it we are talking about bell peppers??
If so I always buy tons of them when they are cheap and in season and oven roast and skin them, then freeze them.
I take the seeds out and roast them in a moderate oven until the skins start to turn a little black then I leave them in a bowl, covered until they are easy to handle. Then I skin them and put them in freezer bags for all sorts of things
I use them in ratatouille, spaghetti sauce, on pizzas, in meatloaves and lots of other stuff. They also keep for ages in the freezer.
These are a great alternative for the ones you get in the supermarket that are always swimming in oil.