Welcome, Friend!
"Greetings, most wonderful customer. Come in, and get cozy in your friend's shop!"
The fellow in front of you is strange, but it seems amicable enough. Behind them- a number of equally as unusual trinkets, ranging from potions, to snuffboxes, to necklaces, and masks.
"This place- your friend found it empty." They nod sagely. "So, free to make trade in. Come- and look at the things your friend has to offer. All is safe- the last your friend has checked."
That doesn't sound exactly promising.
Spend your stray coins for random prizes, or ask specifically expired prizes from long lost festivals of years past- provided you remember their name and their price. You can spend as many coins as you like here- the prizes will be randomized with some consideration given to coin coint, unless you have the exact measure and name of the old prize. Old custom prizes however, cannot be bought.