Homemade tortillas are not only very easy and inexpensive to make (about $.25 for 10) they taste so much better than the store bought ones. This site has other mixes as well. Lots of other mixes on the cheap.
TIP: Get Better Cakes from a Mix + Boston Cream Pie
AKA Heart Attack Cake OR THE REASON PAULA HAS DIABETES Better Cake Mix Trick - Look at the directions on the cake mix box� add one more egg (or add two additional if you want it to be really rich) double the oil amount, but use melted butter instead of .
2300+ Homemade Dry Mixes ~ this is the motherload of all DIY mixes on the web! These are broken down into 31 categories and include hundreds of "convenience" mixes like cake mixes, taco seasonings, copycat recipes... wow!