If you drop by while supplies last, you can get your hands on a 4-piece pack of ooey-gooey mozzarella sticks for less than $1 (tax not included). In order to take advantage of the offer, simply stop by any participating location on Thursday, and you’ll be … Sonic Drive-In has mozzarella sticks for 99 cents all day June 18. This promotion is valid for Sonic mozzarella sticks, which come with four pieces per order. Sonic Drive-In is offering a 4-piece order of Mozzarella Sticks for only $0.99 on Thursday, Sept. 17!. There is no coupon or promo code required to get 99-cent mozzarella sticks, but there is … Sonic… Sonic must have a surplus of mozzarella sticks, because there doesn’t seem to be any other reason for handing these babies out so cheap. Sonic is running a limited-time promotion on Thursday, February 13, 2020 where anyone can score an order of Mozzarella Sticks for 99-cents. DINING OUT: Where to eat and drink right now in Houston's Heights No coupon is necessary -- just drive on up.