First things first: the new Sinful Colors Limited Edition Almost Famous Collection of glitters at Walgreens is also available at Rite Aid, only it goes by the name Paparazzi Collection (I'll be posting pics of that display tomorrow if you're curious what it looks like).
Within the Almost Famous/Paparazzi Collection, there is a shade called Show Stopping. The moment I saw this polish in person, I knew it reminded me of another polish. Sure enough:
Sinful Colors Limited Edition Nail Color in Show Stopping
Sally Hansen Xtreme Wear Nail Color in Strobe Light
Sally Hansen Strobe Light is a permanent shade that you can find in the core Xtreme Wear line. I took a close look at both polishes and they are pretty much identical. Maybe--just maybe--the holo glitter in Show Stopping is a hair bigger, but that's it. As I was writing this post, I did a quick search to see if anyone had swatched the two side by side, and sure enough, someone has!
And in case you didn't know, Strobe Light is a lookalike for the OPI Katy Perry shade, Teenage Dream (minus the pink tinted base). So, by default, that means Show Stopping is too!
Hope that helps!