Most grocery stores will have scrap bread that they sell for real cheap in the bakery section. Better than the processed stuff, but can be crumbly for your car so use at your own risk. As well, if you do buy nuts or granola, don't buy them in prepackaged amounts, go to the bulk section and buy them from there (unless you are in really really poor and rural areas that don't have that convience). Otherwise, all the other advice I:ve read here has been solid.