I'm guessing you're referring to the Twin Chip Fury (at eyeboot:
http://www.eyeboot.com/twin-bitfury-usb-miner , out of stock as you mentioned). You can still find some on e-bay or possibly a private seller on these forums.
There are some alternatives, but stock is an issue for most of them.
NanoFury II - page states there's a few left, but actual store front-end says out of stock:
http://moonlightminer.com/TwinFury: You'll have to google around, none of my links point to active sellers.
Bi•Fury - still in stock, but is fairly expensive (all StickMiners are, relatively speaking, but compared to other dual-chip ones that are/were for sale), out of Poland:
http://cryptostore.io/?product=bi%E2%80%A2fury-55-ghs-usb-minerOther alternatives may be:
hex•fury - uses 6 chips, rather than 2, from the UK:
https://www.asicrunner.com/HexFury--11GH-USB-Stick-Miner_p_9.htmlNanoFury 6 - same sort of thing, available sometime this week:
http://moonlightminer.com/And of course single-chip solutions, of which I'll just mention the YellowJacket, as that's also available from the same UK store as the hex•fury:
http://www.asicrunner.com/Yellowjacket--2Gh-USB-Stick-Miner_p_8.htmlYou can check the thread in my sig for some other options (might also be worth reading through the ROI section), but finding active commercial sellers for these things is easier said than done. Push comes to shove, post a 'WTB' in the
Marketplace forum area