Free Shopping Carts

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I've been looking for free shopping carts, just in case. However, I don't have any money at all to do ANY e-commerce. I want to sell my ebooks for big profits without even touching my wallet, whipping out any credit or debit card, nor jumping any hoops to put it in motion. Are there ANY free shopping carts to use with Paypal, Clickbank, etc. and one that works with free websites?