Upon a google search the specs for the amp seem to range quite a bit from seller to seller. The manufacturers website sucks. But to generalize from what I've seen is that RMS specs tend to be about half the max output. But this is definitely a lower end amp so the range might be even greater.
What would I pay for it? I wouldn't pay anything for it. But if I was to I wouldn't pay more than $90 - $100 for it.