A:AnswerYes it does use wifi. You'll need to buy the Nintendo Online subscription if you want to play games online with people, such as Mario Kart 8, etc.
A:AnswerIt has 64 GB of internal storage which is double that of the original switch and switch lite. It does have a microSD card slot in the back which you can use to expand storage.
A:AnswerThis happened to me a few days ago! At the store I went to, they were NOT in their display case - I had to ask at checkout. I actually had to convince the lady there that you could NOT buy them online and that it DID say they had some in stock. Finally, she went and saw they had some stashed away near checkout!! ALWAYS ASK!!
A:AnswerTo find my Switch OLED, PS5, and XBOX Series X, I used an app called HotStock. If you want to pay for the premium service, it's about $5 a month, but I was able to get my Switch without paying for the service. It'll alert you when a store of your choosing has them in stock and will redirect you to the store's listing.