If you have a Shopko store in your area (continental US), try there as another option to purchase a Switch. After a couple of months of semi regularly looking at Best Buy & Target stores in my area for a Switch, I had a 'V8' moment after leaving a Best Buy store Switch-less yet again... and it occurred to me to travel a short distance to a nearby Shopko store on the off chance that THEY might have one, well, lo and behold they did!
More than one actually as there were a couple of tickets (which you take to the registers to have redeemed, on a one ticket per one system basis) out on the sales floor, and the cashier then called to have a Switch brought to the register for the ticket I had. The cashier I spoke with said that they had gotten 5 or so units in their most recent shipment of them, and, like I said, there were at least a couple of tickets out on the sales floor for purchasing of systems. Now... YMMV when it comes to lucking out for buying one at a Shopko, but at least they're another option for seeking them out... if you have one in your area