looking to enter the blazer game - advice for versatile first blazer?

I dress pretty casually for the most part, but upon getting dressed for a broadway show last week i found that I am pretty lacking in the “more formal” department. I’m thinking a blazer would be a good addition to my existing closet and widen my wardrobe on the formality spectrum.

Ideally would like to find a secondhand one on ebay or elsewhere, $100 or less.

what are some brands/keywords to search by? and what’s a versatile pattern/color? I wear a lot of earth tones so am guessing a navy or brown or houndstooth or herringbone blazer would get me pretty far but what do you think?
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