I can relate to how upset you are but I would not let one bad experience ruin possible future good experiences.
I have spent thousands of dollars and hundreds of transactions with Lowes. 99 plus percent are positive. The worst experience ever with them happened to be a project on my own home, really screwed up carpet order. I was pissed and we had a heart to heart, they apologized, adjusted the price, which at that point was all they could do, and we moved on. I still buy there and enjoy their great customer service.
Try to get over it and move on.