When I started off I was getting $15 and hour for both ground and flight.
It gradually worked its way up to $30 with experience (Total Time).
I guess it depends on the market, cost of living where your instructing.
I am not sure if there are any flight schools in the states that have the J1 visa program any more. ummm, how do a lot of these big schools find replacements for the hardworking/time building J1 instructors?