A co worker told me she wants to buy a potato bag from me. i did tell her that the material was expensive to buy and i had started putting a plain material inside to cut down on costs. she has one already and loves it - she bought it at a craft show (not from me) now she knows i am making them and wants to buy one. what do i charge?? i don't feel i am that good to charge anyone but i don't want to give it away. i also let her know that i did make them with 100% cotton material, batting and thread.