"Merchant" is fine. Avery gets her goods all kinds of ways. Of course when she can, she makes or finds items herself, but she's not afraid to pay others if it'll lower the cost in the end.
To fully understand how Avery goes about sourcing her goods, you need only look at actual small odds and ends shops irl, just with a fantasy twist. One could say that her own specialty is procuring goods on commission, though she also has things in house to sell too.