You can still get Win7 on rigs from Dell. FWIW.
Where you are, perhaps. In my neck of the woods, it's all Win 8 machines these days, and asking for/trying to order a Win 7 PC will result in a "no can do" Proprietary machines now come only with Win 8 pre-installed here in Oz. In mean, there may be the odd few stores in the boondocks with one or two Win 7 machines left, but they're as rare as rockinghorse shit in mainstream Australia.
I know of a few smaller PC shops that can still build Win 7 rigs for people, they still have the discs, but a recent query for my neighbour with one of the larger stores was met with: "Sorry Microsoft recalled all our Windows 7 Discs. All we have left are Windows 8, if that's any good....." It doesn't matter to me because I already have Win 8 installed an I'm loving it, but my neighbour is getting a bit frantic because she definitely does NOT want Win 8... despite my showing her that it is the same as Win 7 underneath and how easy it is to use with Start8, etc. Nope, she won't have a bar of it and says she can't afford to get one with Win 7 built [about 200 bucks more].... so I'll leave her with it until she makes a decision one way or the other.
I really can't understand all this pissing and moaning over Win 8. Sure it brought in some new features... call it Metro, but underneath is a sturdy, reliable and useable desktop just like Win 7's... only faster and with some useful new features.