Be aware that there are some coupons circulating that will not be accepted. One of them is for oscar mayer deli meats and has an expiration date of 11-31-11. Another is a $4 coupon for a 12 pack of Dr. Pepper. These all come from the same site.
One should always get their coupons from reputable websites. Aside from potentially getting coupons that are fraudulent, there's a good possibility that the coupon app or the website itself contains a virus, or malware.
I had the Dr. Pepper q-pon actually 4 of them and didn't have a problem with redeeming them, this was back in the spring
I can't remember the website, but when I go to work later this week, I'll make a note of it. All the coupons were from one site...it began with a D, but that's as far as my brain will recall at the moment!
The ones I was referring to are from Discordia and E-centives. A great site for checking out the "too good to be true" coupons found online is: www.couponinformationcenter.com