High-value $3 coupon off Preference by L'Oreal hair color

Print your coupon for $3 off one box of Preference by L'Oreal hair color here.  This is pretty high-value for this product; the largest manufacturer's coupon I've seen so far for this pricey hair color is $2.  Walmart often has Preference on sale for around $7, so this should make for some near half-price purchase.