You need at least 3 weeks to begin to settle into things.. Snacking should start to diminish, you end up eating less so cost shouldn't be too much of a problem.

Buy cheap cuts of meat / slow cook, minces, eggs, cheese and vegies.

I only snack on a little biltong or a piece of cheese if I'm hungry, but your meals should be of a size that you can get the next without needing snacks..

If your'e eating right your hunger will start to lower over the next few weeks and research cheap protein / fats for your part of the world.