This doesn’t apply to every dollar store, but 2 out of the 3 I went to in search of cards had this. They look similar to the 9 card packs and you’d probably get mixed up if there’s a whole lot, but these 2 booster packs are gold.
Many of the ones I bought were split with Chaotic and Power Ranger packs. Other old and obscure card games appeared as well, such as The Hunchback Of Notre Dame and VR Troopers. Recently I’ve been seeing stores stock these more and more, so if you have one in your area, it’s worth a look.