It amazes me how generous people can be when you just take the time to ask.
Case #1. My previously-mentioned paper folding escapade with my Algebra 2 kids last year. All it took for me to get 2 large (!) pieces of paper was an email and a special trip to pick them up. For free.
Case #3. One of my twitter friends sent me some files today that I'll be able to use in precalc to help the kids get ready for the AP Calc format. Twitter. I can't say enough. If you're not on twitter, get on it. If you're not hooked up with a good group of teachers to help you, let me know. You're seriously missing out. And you know what? It's free.