Stay away from these crooks. I placed my first order through them on December 1st on an eBay order for about $1,000. A day or two later I placed two more orders through them, again on eBay, but one was for $30 and one was $50. The only order that processed correctly was the $30 order for a whopping $.22 in cash back. When I inquired about this, Extrabux responded with "eBay US does not post cash back to Extrabux which means they determine this order is non-commissionable. Unfortunately, due to special circumstances with merchant eBay, you are not able to send inquiries to eBay. We are sorry that we are not able to get you cash back for your order. We would like to get you cash back as much as possible, but if the retailer won't pay the commission then we are unable to give you cash back."
So basically Extrabux is not honoring the cash back and telling me there's nothing I can do about it. According to numerous other reviews online this company does this a lot.