I agree with the above posts
Also, what is not clear from your OP is where in Ethiopia you want to live, major city is Addis. The rest are towns, and even in a place like Gondar, a university town in the north, a 3 bedroom house will cost more than 200 US dollars, unless you want a rotten place, without proper bathroom etc. As a foreigner you will not get a cheaper place.
I have a friend speaks fluent Amharic and is an excellent bargainer, and she pays 4700 birr (I pay 6000 birr, 16,6 birr to a dollar) for a 2 bedroom with a garden in the Shola area.
only cheaper place could be an appartment in Gerji Sunshine condominiums in Addis, but again, not less than 250 to 300 USD for a three bedroom place.