Was able to find all four Power Blue SuperChargers (Power Blue Trigger Happy, Power Blue Splat, Power Blue Gold Rusher, Power Blue Splatter Splasher) at 2 different Walmarts in my area today.
Here is a quick video!! https://youtu.be/HQDIMOZ6tAI
They also had a healthy stock of the newer waves as well (astroblast, sun runner, tomb buggy, and much more). I took some footage of the stock at two of my Walmarts as well
Happy Hunting!!