Circa 15 years ago when (most) states had no mechanism to tax Amazon purchases at checkout, and prior to it being flooded with made-up vaporware Chinese brands, Amazon had "good deals". They would usually beat retail stores in your area by 10-15% and they didn't have to charge sales tax.

Those days are long gone. You can't even be 100% certain the legit branded stuff you buy on Amazon isn't fake. (Unless they've recently taken new measures to avoid stock mixing and prevent that.)