The M&M company does offer printable coupons. As of July 2015, a 10 percent off printable coupon from M&M was available on Coupon Sherpa. Other M&M coupons were available for sale or online on Coupon Sherpa.
In addition to coupons offered by the M&M company, many retail stores occasionally offer printable coupons for M&M products. For example, in July 2015, Printable Coupons & Deals.com had printable coupons offering a $1.00 off packages of M&Ms if purchased at Rite Aid. Other offerings on Printable Coupons & Deals.com in July 2015 include printable coupons valid for M&M purchases at Target. Because coupons expire and are constantly being issued by manufacturers and retail stores, it is good idea to check coupon sources frequently for the most up-to-date deals.