Campbell's Soup Coupon Used Right

Today I price matched at Walmart! I price matched the Campbell's Condensed soup from Zehrs that was on sale 2 for $1.00. I had the coupon for $1.00 off when you buy 4. I purchased 8 cans for $4.00 - $2.00 in coupons making it $2.00 for 8 cans or $0.25 per can! Regular price at Walmart is $0.97 per can which would have been $7.76. I saved $5.76 or 74.23%