What Are Your Favorite Kratom Strains and Where Do You Buy Them?

So, my friend is a manager at a smoke shop, and he’s looking to start carrying kratom but doesn’t use Reddit, so I’m asking on his behalf. He’s curious about your favorite strains and where you typically buy them.

Which strains do you like best, and how would you describe the effects of each one? Any feedback would be super helpful. Thanks in advance!