Miller's Twist in the Reading Terminal makes pretzels. They're the same merchant that sells lemonade and ice cream. The Pennsylvania General Store sells a variety of postcards, as do some of our temporary merchants located on the day stalls throughout the Market.
pretzel factory at suburban station
There are two great bookstores, where they might have interesting postcards. There's a couple Amish stands with pretzels, the one with the big fresh lemonade decanter in front has GREAT ONES, can't think of the name
I can remember the name of the kiosk but anyone can direct you. Hallmark stores are closing so you can go find postcards etc at a discount
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