I ordered auto fem (and regular) seeds from Demonic Genetics on Strainly.io and they’ve turned out well. I just harvested the first couple this week. You can see pics in my grow thread: https://overgrow.com/t/barefoot-and-blazeds-benevolent-buds/
The breeder has 100% positive reviews, reasonable prices, takes Venmo, and ships quickly.
I transplanted a couple Mephistos out of Solo cups last night. There’s a Sour Crack and a 3 Bears OG x Strawberry Nuggets. I expect them to be excellent plants. Mephisto seeds can be hard to find due to their popularity.