Are Imaginext Slammers Near You?
You can check your local Walmart Pick Up from store by using the Walmart direct link.
Now that they have been found, you can use BrickSeek to search Walmart, and Target, by their UPC code.
Imaginext DC Super Friends Slammers Vehicle & Mystery Figure Sets (Character May Vary)
MSRP: $7.97
SKU: 429593818
UPC: 887961874839
It looks like a few are in stock in California!