Most of the stores I shop in Dallas haven’t offered bags at all for the duration of this ordinance. A few others have used their existing stock without the required physical changes (such as company name/address) and no charge—basically thumbing their noses at and leaving it up to the city to come down on them. And today, I saw plenty of bags floating around a parking lot next to Medical City. They can charge you five cents, but if you’re the littering type, it’s not going to change your behavior.
I drive around Dallas a lot, and in the areas where there is traditionally a lot of discarded plastic bags the bag fee made... absolutely no difference in observed levels of bag litter.