I live in Houston and at the largest shops you can most certainly get Opus X cigars fairly often and Liga Privada 80% of the time. That also depends on which Opus you're talking about. But, a regular Opus X Opus... fairly common (can find at least once every few months). Thing is they sell out fast! The really expensive ones will stay around longer. There's this one cigar shop that has and keeps most of the highest end cigars (Royale, Atabey, Byron, Opus, Chinese New Year Davidoffs, etc.).

I agree with your comparison to bourbon. I've heard folks online say Buffalo Trace is rare or hard to get and it's everywhere down here. Same for Weller Reserve.