MrRoughton.com is completely free to use but if you'd like to help you've got options!
Option 1: Shop at Amazon
You probably do this already (I sure do) so this one is easy. If you click on this link first and then shop as normal MrRoughton.com will get a small percentage returned as an Amazon gift code. I've used this to build out my classroom library and my students are very appreciative!
Option 2: Share your Experience
This one costs you nothing but your time. Whenever you use any of my lessons just let me know via the contact page how it worked (or didn't) for your students. I'm always looking to improve the content of the site and while my 150 kids serve as a good test group they certainly don't represent every student. Your comments helps make the site better for everyone.