I don't shop at Costco exclusively. I also shop at my favorite thrift store, and yesterday I found a cast iron Griswold frying pan. I needed a small frying pan, and I didn't have a cast iron skillet. (I'm going to tie this into Costco in a minute.)
It was filthy, and I didn't buy it; but, when I got home, I looked up cast iron on the Internet, and, according to the Internet,(lololol) cast iron could be cleaned in a self cleaning oven. To make a long and very smoky and stinky story short, that worked.
One of the first things I relearned about cast iron is how easy it is to burn yourself. The cast iron holds the heat much longer than stainless steel, requiring a different technique from cooking on gas. You no longer have the ability to easily regulate temperature.
My first effort was a grilled cheese sandwich, using Alpine bread and Kirkland sliced cheddar cheese. Honestly, I was impressed by the taste and crispness, I hadn't cooked with cast iron in almost 40 years, and I had forgotten what great things it can do for food.
My Panko covered eggplant for lunch was a learning experience, in which I learned: when the heat is even, the slices need to be even too.
Today I noticed the West Nashville Costco has the cast iron cookware on sale. The prices are great, if you want a griddle with ridges or an 8 quart cooker, go quick.