"Cheap" is my favorite word! Well maybe second favorite...
There are always exceptions, clearance, thrift shop finds etc, but for the most part you truly do get what you pay for. Forgive me if I leave any out as there is a ton of work making this operational. The wiki sums this up better, but your options for orbiter 'types' is:
web-orbiter 2.0 : laptop, pretty much everything with a browser. I have used this on a Nintendo DSI XL. No streaming cams to this, unless you tab switch away from the orbiter and open the cam url directly.
embedded orbiter (such as webdt-366, cisco 7970 and similar): I believe this is what you are referring to when you say Linux OS running. Supports streaming cams on devices I have tested.
JavaMo: have not tested
iOS apps : (Dianemo S, Roaming Orb) : Andrew will have to correct me here if I am mistaken but I believe cams are not supported for linuxmce on dianemo S due to their integration of kmotion??
qOrbiter: This is exciting! I do not currently have a capable device to test but the work being done is game changing. Again you are going to get what you pay for in performance. A tablet that was mentioned to me as pretty standard hardware capable of taking advantage of qOrbiter would be the Nexus 7. Something very important to consider here btw is that investments here are not "home-bound," a tablet away from home functions like a tablet, when home it also becomes an orbiter.
One more point of clarity, I am used to having to make this distinction when introducing the system to family members. Security Cameras being the exception, an orbiter does not play media. Orbiters control Media Directors which play media. If you can remember Media Directors as moon## devices the orbiter reference becomes easier to swallow as orbiters can control (orbit) a moon. To cement this open an on-screen orbiter and change its room. This one is the hardest for people to grasp i feel because a TV screen/monitor is viewed as a single image. What you are seeing though is:
you on-screen orbiter (living room) media director (living room) display
change the onscreen orbiter in the living room though to bedroom and you get:
you on-screen orbiter (bedroom) media director (living room) display
Play a movie using the onscreen orbiter now and the bedroom tv wakes up and starts playing.