Maybe on the website but not in-store
They frequently have a selection of keyboards there, but full size pianos are seasonal in-store, as Dawn mentioned.
I have seen pianos there at certain times
No. I've never seen a piano there in any of the stores. They may sell it online I'm not sure. But not in the store.
Certain times of the year, but not regularly. You could check Costco.com
Thanks! Your answer is awaiting moderation.