Avid Outdoor work boot

I have bought 2 pair of boots in the last 2 months both pair on the bottom around where the heel is has busted out. the boot's are very comfortable but can't keep paying that much for something that doesn't last. I bought them at the Wal-mart in Crossville but didn't see any need in keeping the receipt so can't return them, I am a contractor and wear them to work everyday, but unfortunatly they don;t last long.