MadCatz is supposedly coming with the MOJO, a Tegra 4 power Ouya competitor but it’s not particularly cheap at 250$. http://madcatz.com/mojo/en-us/
If you want Tegra 4, Tegra Note tablets (reference designs sold to OEMs by nVidia) are starting to show up too at 199$ a piece: http://www.anandtech.com/show/7508/nvid … e-7-review
As for set-top boxes, RikoMagic just announced the MK902 (http://liliputing.com/2013/11/rikomagic … ni-pc.html) which looks very similar to one of their previous stick (MK802 III or was it IV? They iterate way too fast!) but in a set-top box form factor.
There’s the Minix NEO series from J&W too. The main SoC is the same as the MK8xx and MK902 though (Rockchip RK3188 or RK3066) (http://www.minix.com.hk/Products/MINIX-NEOSeries.htm) so don’t expect great shader performance. I would expect a tad better official support and build quality but I can’t say for sure. I’ve used some of their Mini-ITX AMD motherboards a few years ago and was quite happy with it.
But the problem is that all of these Rockchip and Allwinner (A1X) SoC-based sticks and set top boxes suffer from the same issue : weak GPU (graphics are handheld by a Mali 400 which is starting to show its age). But if you couldn’t care less about shaders then, as steev said, most of these pack a decent punch for the price.
Also, you can go Linux on the RK3xxx sticks with PicUntu but since there is no driver for the Mali GPU (maybe down the line with the LIMA project?) you won’t get hardware acceleration/shader support.(http://liliputing.com/2013/10/picuntu-4 … vices.html).
If you want something x86-based, Zotac or Giada may have some Celeron 857 or 1007 mini-bare bones worth looking at. But don’t expect great graphics there too.
Personally, I’m waiting on Bay Trail desktop motherboards (Pentium-J 2850) since Intel has a decent track record with Linux drivers but I’m not expecting miracles from the castrated Intel HD on there.
@hunterk: how does the HD 4000 behave with the most demanding shaders (crt-halation etc…)? I have a 720p TV and I think I might just save a bit more and go with one of the Haswell-based Gigabyte Brix (http://www.gigabyte.com/products/list.aspx?s=47&ck=104) if the performance is alright…