Im sure they do..
There's more than one Costco and they don't all carry the same things. Things rotate through very quickly. You should call the Costco that's closest to you and ask. If they don't have it, they will check the computer to see which stores do have it, if any. They will give you that location. If you are nice to them, they will call that location and ask them to hold it for you.
I don't think that they do? But I wouldn't know because I don't have a switch so I don't look for things having to do with a switch.
I am not sure
The only Nintendo switch product I have seen is the actual Nintendo switch product for $365
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