Can I use coupons not provided by Extrabux and still get cash back?

Not usually. If you use a coupon not provided by Extrabux, you may not be eligible to earn cash back on the purchase. Even coupon codes you receive in an email or regular mail directly from the store can invalidate your cash back. The stores oftentimes use coupon codes to determine the source of the order. So even if you click through Extrabux, but use a coupon code not found on Extrabux, the store will credit the order to the source of the coupon code and not Extrabux. It's best to check the Extrabux store page to see if there is a similar code available that you can use and still get cash back. If not, we always suggest you find the best deal for you.