Costco has its tire replacement policy but a tire buster is a tire buster no matter where you go.
In 2002 I brought a set of new 15" wheels to my local Costco tire center to replace the 14" wheels that came on my car. I asked for P195/65R15 tires, the tire specified on upper trim levels of my vehicle, the counter man told me that they couldn’t install that size but they could install P205/65R15. I accepted, I din’t mind the wider tires. They charged me a tire disposal fee on that invoice, I dropped the new wheels off in the boxes that they came in.
Two years ago I ordered a set of tires at Costco online. I went to pick them up, paced the floor for 20 minutes, inspected the tires that I had ordered and finally there was a counter man available. I handed him my membership card, all of the information should be on the computer, he told me that I would need the “order number” for me to to receive my tires. I returned one week later for those tires.
Last year I ordered a set of tires for another car that were one aspect ratio larger than the original tires, they didn’t check to see if that was the correct size.