I've been going around the internets looking for some cool Thyroid Cancer awareness things to wear and show off. The best I've found so far is Choose Hope. They have stuff for all types of cancers (some things they have more items than others), and a lot of different things. They have magnets, pins, hats, apparel, and bracelets among everything else. My personal favorite section is the Cancer Sucks section, because, well, it just does! They also ship pretty quickly, even if you do the cheapest shipping!
Hope and Dreams also has a section on different cancers, and there's a large selection of Thyroid Cancer awareness shirts and stuff!
Go out there and get the awareness out!