[CPA] Traffic sources for low payout offers?

I'm almost new in the IM world, specially in CPA.
I am interested in promote Email submit offers. Currently my main traffic source is Bing Ads.
The thing is, how can I make it profitable if I pay $0.90 per click, and the payout is $1,30?
I mean, I would need a CR above 70%, which is veeeery difficult. It makes me thing Bing Ads is not the right traffic source for this kind of offers (very high CPC)
So, what traffic source would you recommend me for low payout offers in order to achieve a positive ROI?
Mascot Maker Using Powerpoint : http://store.gottamore.info/products/
Sign Up - Free Access To $500 Of Internet Marketing Software, Training & Designs
$ POPS GUIDE - YOUR FIRST CONVERSION GUARANTEED! $