Crediting Emma O (@smil.eface5) for the shop stall.
First, you want to make a shop stall. Do this by getting two signs that are either wooden or metal. Then, get two poles, and layer it so that the poles are “behind” the signs.
Next, grab some text. The top panel should have the shop name, and the bottom should have the price. I’ll use “free”.
After that, put down some item spawners if you’re doing “free”. If you’re doing an actual price, use vending machines. I recommend using grid snap at 8 for extra neatness.
This is a nice guide that would have been useful before the update. But you could use the actual market stall prop and incorporate vending machines to sell some items.