Any time you buy something through Amazon using the search widget on the right side of the blog, it puts a little money in my pocket--and Amazon usually has astonishingly good prices on things. As an example of some recent purchases my readers have made, and what it put it in my pocket:
SanDisk Sansa Clip Zip 4 GB MP3 Player SDMX22-004G-A57K (Black) $1.40
Symphony No. 9 in D Minor, Op. 125 "Choral": IV. Presto - Allegro assai - Choral Finale (Ode to Joy) $0.04
CamelBak Cleaning Kit with Cleaning Tablets $0.66
Sensodyne Maximum Strength Toothpaste For Sensitive Teeth With Fluriode And Cavity Proctection, Original Flavor - 4 OZ $0.15
These are all little amounts of money, but as you learned when you took calculus: adding up enough infinitesimals eventually turns into something!