A:AnswerThey were just restocked on Monday. They restock multiple times a week. Try installing an extension that detects when there is a change to the website. We did that and were able to snag one. If you are able order it you can only pick it up at the store, so if your closest store doesn't have it try other stores.
A:AnswerIf you're talking about a multiplayer game like Super Smash Bros, then all you need is a second pair of joycons and you're good to go. You really only one game to play it localy as one Switch can pair with up to four pairs of joycons. Of course, that's providing that neither is playing any Singleplayer modes.
If you're talking about a single player game like Splatoon 2 (It's a multiplayer focused game, but it only allows one person to play it at a time per device,) then if they want to play at the same time they'll each need a Switch, and a copy of the game, Cartridge or Digital Download from the Nintendo E Shop. And if they want to play together or against each other, then they'll also have to be near each other for local wireless, or connected to the internet, which requires a subscription to Nintendo's Online service.
It really comes down to what games they're playing. Really the only other things you need for the switch is the Dock and an HDMI cable to the TV, both of which are provided right off the bat with the switch itself.
A:AnswerYou'll have to look in-store to see if this is the new, refreshed hardware. You can tell by looking at the box (the new one's box is nearly entirely Red, as opposed to the red/white box of the older hardware).
You can also tell if you have the console in-hand by looking at its serial number. The newer, refreshed hardware has a 01 at the end (i.e. MOD HAC-001-01)
A:AnswerUsually if you purchase the console as a "bundle" it includes the game as a digital download so the game will not be delivered separately. I would check the description of your order to ensure this is true, if so it should be loaded on the device already or within the device packaging.