Well, based on some stats about Avalon group purchase costs:
10,000 avalaon chips are capable of 2.82 TH/s.
10,000 chips costs 782.1 BTC (or thereabouts) this is roughly $78,210
Just for bare chips, that works out to $27/gh. Bitfury chips (when you could buy chips alone) in small quantities were $25 per 2.7gh/s chip. So that's $9/gh, which is a third the cost of avalon. And those exist. If KNC ships this year, that's another. And there's always ASICMiner. It's much less than $92M usd to hit those numbers. Cut that in half, at least.
And that is all the stuff that is publicly known. There could be more that nobody knows about yet.