Where can I find strong sharp tasting olive oil in the US?

Your best source for quality olive oil with strong flavors in the US is going to be a specialty market, either an upscale "gourmet" one, or an ethnic market, such as a Greek, Arabic, Italian, or Turkish market, or even a specialty olive-oil only store. Farmer's markets can also be a good source of premium olive oil. Once COVID is over, you can even find markets that will let you taste their olive oils, so that you can pick the one with the degree of pungency you're seeking; many producers create a range.

The bitterness you're talking about is hopefully from oleocanthal and is a sign of quality. I say "hopefully" because there is a lot of fake virgin olive oils out there, and the wrong kind of bitterness comes from "deodorizing" low-quality oils. These taste different, but you'd have to try both to recognize it.

You are also right that most Americans don't like pungent or bitter olive oils. That's why the oils you buy in mainstream supermarkets are usually bland, and why you usually need to go outside of them to find better oil.

The fake olive oil problem is why I can't recommend trying to find any high-quality Turkish olive oils here in the the US. While Turkish producers to create very fine olive oils, overwhelmingly what reaches the US is fake olive oil with Turkish labels, and there are no reliable brands available here I've found. So I'd recommend getting an oil from Greece, Lebanon, or Israel instead, since all of those countries do have import channels that follow labelling laws and their oils should be fairly similar to Turkish.

This is also why I'm avoiding the term "extra virgin" in this answer. The US does not enforce conditions on "extra virgin" labelling, so seeing those words on the bottle tells you absolutely nothing. Instead you need to go by producer and recommendations.