Check out the Gatsby Chocolate's store locator page to see if you have a local retailer carrying these. If you do, then click that banner at the top of the page to get a coupon good for a free Gatsby Chocolate bar, up to $4.99!
In order to get this coupon, you'll need to confirm your phone number via text or call. Unfortunately, it rejected my Google Voice number, so you'll have to use your personal cell number on this offer. However, when I printed my coupon, it actually printed two unique coupon codes on a single page. So in actuality, you'll get two free chocolate bars!
[thanks to Freebies 4 Mom for finding this!]