One of the more interesting things I saw last year was that Jennifer Laura Thompson has created Dear Evan Hansen themed jewelry.
FYI, in case anyone is interested, her jewelry is regularly sold at the merchandise booths in the theater (assuming they are not sold out).
Shows usually do not sell current merchandise at the flea market, as they would have to purchase it in advance from the merch company. In this case, JLT may create some jewelry specifically to donate to the flea market, but since it would be essentially competing with their own merchandise company, I'm guessing what's available at the flea market will be different than what she makes for the theater to sell, either an exclusive design or an up charge for a photo with her, something like that. I could be wrong, but that is my guess.
Each of the merch companies has a table at the flea market, so if you're looking for official merchandise, especially current merchandise, that would be your best bet.
Nothing matters but knowing nothing matters. ~ Wicked
Everything in life is only for now. ~ Avenue Q
There is no future, there is no past. I live this moment as my last. ~ Rent
"He's a tramp, but I love him."