Heartface - One-click checkout for anything, sold by anyone, everywhere.
RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Xpresslane - Universal one click checkout for shopping on the internet
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything
Checkout Page - Sell on your site with customizable checkouts. Tailor-made one page checkouts to sell digital products & services without an ecommerce store.
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.