Every Friday, you can visit http://realchocolate.com to request a coupon for a free candy bar!  They give away 250,000 coupons every Friday.  But you don't get to download the coupon.  They mail it to you and it could take 6 weeks.  It's not instant gratification, but it is free.

The promotion goes through Labor day.  No more than 1 coupon a week or 4 total to the same address.