Mouser is one of the leading electronics distributors in the world, along with digikey. TDK is also legit, I've used a bunch of their sensors.None of the consumer SSDs you'll find in the market in general are SLC. They're either TLC or QLC. They may have some SLC cache since SLC is much faster than TLC.
SLC SSDs would be way too expensive for general consumers. Here's a random website (not sure if it's genuine or not) with a listing. ₹35,000+ for 256 GB
Or this 320 GB for $900
SLC SSDs will be really expensive, great for when you need sustained high throughput, as there's no cache filling up with those, they are the cache. They also have better shelf life and lower probability of bit rot.