There should be an "undo last transaction" button in the shop. The price differential between buying and selling things is so wide, that accidentally buying something you can't use or the wrong item is really frustrating ... especially if you are new to the game and didn't learn the hard way already. It's a good idea not to tick off your players early. =) I just joined the beta a couple of days ago -- I am really liking what I'm seeing. The overall concept and artwork is charming and I really like the progression in getting better equipment and cards.
