This is easy and cheap.
butter
onion
(any other vegetables)
Cook these. Add them to
1 can salmon
1sp ginger powder
1tsp mustard powder
1tsp+ dill
3 tbs ACV
2 whole eggs
Mix all of this. Shape into patties. Since I did not use any binder besides eggs, I make them small. I also cook on a little higher heat to toughen up the proteins, and do not use a lid to evaporate the liquids. Cook through till desired in consistancy. Use about 1/2tbs of butter for each patty.
If you use binder like crumbs or flour, you can take one egg out. Substitute the binder for the egg. My guess is a few tbs of whatever should work but more if they are larger crumbs. When the salmon mixture is getting firm but not dry you are good to fry them.