This isn't really cheap-cheap, but the local stores have started selling fresh wild caught salmon for reasonable prices.
I was in the mood for red pepper too, so I made up this recipe... it doesn't have a name.
1-1.5 lbs salmon filet (I usually ask for filets near the tail, there are fewer bones)
1 Tbsp balsamic vinegar
1 Tbsp olive oil
1 clove garlic, coarsley chopped
1/2 tsp salt
1 tsp dried basil
1/4 tsp black pepper
1 small sweet onion (vidalia or walla walla)
1 red pepper
Drizzle a little olive oil in an 9x11 baking dish and place the salmon filet, skin side down on the oil. Combine the vinegar, oil, garlic, salt, pepper and basil in a separate small dish and then drizzle over the salmon. Cut the onion and red pepper into thin strips and lay the onion on the fish and then the red pepper on the onion.
Bake in a 375 degree oven for about 20-30 minutes, or until the fish is done. The peppers and onions will still be crisp-tender.