I'm a fan of Red Sea clowns as well, and I can say that back pre-pandemic I saw these regularly in our Tampa LFSs. You could probably ask the fish person at that Petco to order from their wholesaler when the time is right if you don't have other LFSs around.
What are you planning tank wise? First one? We can offer tons of advice (probably more than you asked for) if you give us an idea what you are looking to do and whether you want to keep the cost constrained or you don't mind putting in a little more money to keep the maintenance down.
Edit: Never mind, saw your other thread regards square tanks and your intro.

Take a look at my build thread (the Build Thread Contributor badge to the left links to it) as I can so relate to your experience....my first fish only marine tank was back in 1985. Kept tanks when I moved overseas to South Africa in the 90's (very different scene due to lack of imported equipment at the time), then got back in the hobby in the early 2000's here in Florida and have been at it ever since.
So did you decide on a tank? I will say that if you decide to get one with a sump, make sure the tank is drilled, as adding an overflow box (CPR backpack in my former instance) to a non-drilled tank will give you much anxiety now and then.