Haggling
The art of bargaining and making deals. Doesn't always have to do with merch either.
0: You'd pay full price for a discounted item.
1: You've gone to an estate sale or two.
2: You could get the oyster girl to give you a discount.
3: Carriage salesman.
4: People hire you to make sure they got the best deal.
5: You have finessed fortunes from mizers.
6: Rumpelstiltskin