My son just ordered some Auto Meter gauges from Summit. He got Autozone pricing, 20 % off, no tax, and free shipping. Had to call Summit and gave them the 20% off code from the Autozone website.
I just did the same thing. AutoZone had the gauge $13 cheaper than Summit plus the 20% off. I had all of the parts in my cart at Summit and asked them if they would match the discount. They played around with the numbers and I got a 17.2% discount with free shipping. And now AutoMeter is running a rebate that just started today so I'm going to be getting money back from them!