How can I find vegan foods that are not so expensive?

If you want to eat vegan cheese and mayo and stuff all the time, you're going to pay a lot of money for that. My suggestion: do without it. There is absolutely no reason why a vegan has to eat imitation non-vegan foods. Just buy normal foods that are intended to be vegan in the first place. Like that other person said, you can make your own dressing.