I can't speak for every Best Buy, but if the experience at my store is any indication: Best Buy will have a LOT of Switches tomorrow. I think we got about 12 for MK8 launch (last time I remember them advertising stock), but we have about 20 set aside for tomorrow, and in a strange turn of events, they're majority Neon. We have more Neons than Greys 2:1 for tomorrow. Before they close, it might be worth calling your local Best Buy if you're still looking for one.
EDIT: just checked our internal system... appears to be the case all around us. A huge restock is hitting tomorrow, with Neons:Greys 2 or 3:1 depending on location.