Good mainstream place to buy ads similiar to Juicy Ads?
 

I need to buy some 300x250 image ad space for something non-adult related, what's a good place that isn't a waste of time and doesn't cost a shitload?

Guess I could use Google but that gets pricey..

But its also true that you get with adwords the best converting traffic around.
It also depends what your feeding this traffic to, the results can differ a lot.

Just remembered I have this free $100 worth of Adwords or Adsense card someone gave me, anyone get one of those?

But I already have account with both of those, I wonder if I can still use it somehow.