This was a great promo a few months ago, and now it's back!
Dominos Pizza is offering a Large 1-Topping Pizza with extra cheese for just $5.99 when you enter code EMWX7GT3, carry-out only. Apparently, you can order more than one 1-Topping Pizza for that price. Then, you can get a FREE 8-piece CinnaStix when you enter one of these three codes: EBCS, SWEET, or JOBSTIX. Online orders only.
Thanks to Slickdeals for the heads up.