Hi there! I'm extremely tech-ignorant...all I know is that I make one of a kind glass art and I need a cart that will somehow automatically register if an item has sold and not allow a second customer to come along and buy the same item. Is there anything pre-made I can buy that will do that? Or do I need to hire someone to make it? If so, how much would a cart like that run?

Thanks for any help you can give me!
Dana :)