• The simplest, least expensive way to have an e-commerce presence may be not to process payments yourself. Some simple sites choose to create very simply websites (without catalogs or shopping carts) that accept simple payments only through Paypal. And some web retailers do not have their own websites at all; instead selling goods on sites such as eBay.com or Amazon Marketplace.
• Assuming you have a Merchant Account to accept credit cards, the next simplest way to have an e-commerce presence is to use a ready-made storefront template for $25-$200+/month. Companies such as Yahoo and Homestead offer storefronts that you can customize to include your products.
• Paypal offers a merchant account that integrate into shopping carts. Google Checkout integrates with their AdWords program and makes it easy for people with Google accounts to buy goods at your site. Each of these options would require some engineering work on a website. Source

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