What kind of FTA are you after?
You also mention OTA, which usually refers to terrestrial signals via a standard TV antenna.
Are you wanting OTA also, or just FTA via Satellite. You can find sub $100 dollar boxes on eBay, I see new ones pop all the time.
Most of the time they are not "New", just same box with a different name slapped on it.
I would stay away from 99% of those though, because most have no NA support and usually are not well suited for true FTA.
You might find free or cheap FTA gear on Craigslist, but be sure that the recever is MPEG4 DVBS2 receiver and not the older MPEG2 DVBS type and the dish size to be at least 36" with a linear type LNBF.