What things do most people spend money on you don't? I buy very little gas, of course. I have not driven to work once this school year. Probably saved me about $120 so far. I also patch my own bike tubes. I get a lot of flats and most people just replace the tube ($5-$6 each). A patch costs a few cents and if you do it right, it's as good as new. I looked at one of my spare tubes and counted 8 patches. That's 8 flats I got and each time I saved about $6. Almost $50 I saved patching just that one tube. And I have many like it.