On the About Us Page "You can lessen the blow by showing you support" should be your - 2nd paragraph
On the About Us Page "But, the best way to show your support is to buy a t-shirt or two or three." - Last sentence on the page. That's not really considered good grammar. You might consider changing the sentence to something like "The best way to show your support, however, is to buy a t-shirt or two or three." I know this one is a little grammar nazi of me, but starting sentences with but or and is a pet peeve of mine.
On the Mao-Bot product description page China should be capitalized. On the Halftone-Bot page special is misspelled.
Those are the primary proofing issues that I found.