I tried to buy beans from coffee snobs independant stores but all I got was weird and/or acidic coffee
But hey I am a tea person first and foremost, what do I know
That darker style gets frowned upon a lot ("bleuch! it's bitter!"), as a lot of people in the space have kinda embraced the more fruit-forward lighter roast stuff (if you roast darker, you tend to obscure them.) I like that too (some stuff is kickass), I just categorize it separately from darker stuff.
I believe some people have started calling it goop, presumably as an anthesis to soup, which is very coarsely ground espresso typically using lighter roasts.
Not sure where you're based (US?), but there will be stuff out there. Try r/coffee or your local forum maybe? Once you find a really good one, you'll probably just stick with it :-)
If you like Starbucks beans, you'd probably like a better dark roast. Try Lavazza. Coffee snobs will look down on it, but they're highly consistent like Starbucks while offering more variety and more flavor. Lavazza Super Crema makes a pretty nice espresso and is cheap relative to high-end coffees.
The truth is, you can get a really fruity single-origin bean but as soon as it goes into a latte, typically you've lost 99% of the origin characteristics. It gets a bit wasteful and expensive. Cafes typically go for house roasts that lean darker, and I can see why: they just work better in milk!