Tips for buying vintage/used denim?

I’m in the market for a quality pair of light wash blue denim jeans in straight or relaxed fit size 36x32.I read that new denim is low quality unless you’re spending $200+ on a new pair.

EBay was recommended. Sizing and prices is all over the place with vintage, 30-40 year old pairs of jeans. I’m wondering what tips you’d give for shopping for used or vintage denim online?
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