corsair cx500 should be a good one ^_^
Yeah but that's going to be around the $50 - $60 range. The tricky thing is there's a lot of crappy power supplies in the $30 range, you're not going to find a lot of good ones there.
is a kingwin a good brand?
I'm going to say that particular PSU is not good. If it's not certified or rated - don't buy it! It will short out or blow up on you, likely taking most of your components out with it, meaning the cost will be far greater than initial. You're better off spending an extra $20 - $30 on the PSU to avoid having that happen.