Gamer Pro's XBox Series X Question Help!!

Ok, my 18 year old son thinks a local Game stop will have inventory in the morning. He wants to go ther tonite camp out and secure 3 of these. Here's my Question, is he wasting his time as I thought all the units comig in were spoken for?? Can anyone here advise. ??
"if it's not fun, it's not worth it & remember folks, "It's All About The Music"!!