Leave these around town for give them to current customers for a fun way to get people in your shop. Your logo on the front and 10% (or whatever you like) on the back. 

Paper coupons are so old-school (but do work) get your own 3D Printed coupon chips. 

These are about the size of a half dollar and have two sides. Multiple colors are available. 30 chips for $25.00.  

Please allow 5-7 days since these are printed on demand.