A:AnswerYes, it is the linear version. Same model number on Razer's site and the $129.99 price is only for the red switches because sound dampeners are added to each switch. Don't know about availability.
A:AnswerThe Razer Huntsman Mini can use any standard keycap set, yet we recommend checking out our Razer PBT Keycap Upgrade Sets to mix and match your colors.
A:AnswerThe Linear Optical Switch has no tactile bump with sound dampeners to reduce noise as you bottom out your keys unlike the Clicky Optical Switch.
A:AnswerYou can access them by pressing the function key (FN) combined with the corresponding number (e.g. FN+1 for F1) or (FN+P for prt sc). For easier reference when executing commands and hotkeys, side-printed secondary functions have also been added.
A:AnswerI've been to several locations recently and every store I've been too has had them in stock. so really it all depends on where you're located and how popular razer products sell in your area.
A:AnswerYes, it comes with either linear red or clicky purple optical switches. I recommend the linear red switches. It might cost a bit more but its worth the price.