First Slice Pie Café in Chicago is offering a Pi Day deal at their Montrose, Manor and Andersonville locations. They’re offering slices of pie for $3.14, mini pies for $6.28 and whole pies for 20% off. Those who are in the store at 3:14 p.m. will also receive an "exclusive surprise," according to the shop's Instagram post.

For two days only, on March 13 and 14, CPK Rewards members can get an Original BBQ Chicken, Pepperoni, or Traditional Cheese pizza for $3.14 with any purchase of $25 or more. Non-members can enroll in CPK Rewards on CPK.com or on the CPK app anytime through March 14 to get the deal, which is available for dine-in, takeout or delivery.