I'm having a really hard time finding the right shopping cart! Can anyone recommend one? It needs to integrate with paypal for credit card payments. I'd also like for it to be able to accept mailed payments. I've seen some carts that do that but the hard part is that I also need to be able to set the quantity of an item and have it removed from the site once it's been purchased. The site I'm making sells mainly one of a kind items. Whenever I've used Paypal buttons in the past, I have to manually remove them when the item has been sold. I'd also like to be able to configure shipping through this shopping cart because I do not like the way Paypal does it.
Can anyone recommend anything?