Dell Small Business offers the Alienware Unisex Lightup Zip Hoodie for $59.99 with free shipping. That's the lowest price we could find by $30. It features a blue light with three modes (solid, slow blink, fast blink). Two AA batteries are required, not included. It's available in sizes S to XXL.
There are lots of things Uncle Sam can't touch — so long as you play by the rules.