How to spell COUSTCO correctly?

The correct spelling for the store should be "Costco", so if you encounter "Coustco", here are some possible suggestions: 1) double-check the spelling and try "Costco"; 2) try typing in "C-O-S-T-C-O" instead of using a voice-to-text tool; or 3) search for the store's logo/image and use that as reference for the correct spelling.