Buy your spices in bulk. Normally you will only need a couple of teaspoons so just buy that. Also that way you can always have fresh spices.
If you can plant a garden and then plant what you like but also plant what cost you a lot of money to buy. Also plant a variety of things so that you are able to buy less at the store.
Get to know your locally farms and go visit them at least once a week during the growing season. The produce is legally grown, fresher, and often times is much cheaper than at the grocery store!
Popcorn is a great gluten free snack. I buy the kennels (not the microwave stuff) and put a little olive oil in the bottom of a pan and cook it over my burner. You simple take a pot and cover the bottom of the pot with a layer of popcorn kennels than you put a tablespoon of oil in the pot. Make sure to move the popcorn around often so that it does not burn. You sometimes will need to let some of the popcorn out if the lid is coming off. Put it is a bowl and than leave it plain, or salt and or butter it :) It is much cheaper to make popcorn this way. You can also buy popcorn in bulk which makes it even cheaper!!