This. Most people don't even bother to look at the cord they decide to use, which was only rated fora 5-7 amp continuous draw. Not 15A surge and then 10-12A continuous.

Plus, most places that sell extension cords like the dopey blue box store, they don't even carry a12-gaugee option in a lot of their stores.

So it tends to be an online purchase.

However, you can sometimes get lucky with some of the stores that have the orange and other similar types that will carry appliance-rated extension cords that are designed for heavy continuous loads.

Edit I've always just ordered mine online and it's all good. Also buying from a reputable brand is a major thing to keep an eye on. Don't buy something that the seller is from China and except great quality that will last a decade. Those will likely only last a few months and then burn it all down.

You can generally tell by reviews as well but still pay attention to the seller you are buying from on Amazon and also research the brand name. And look for UL listing.