I’ve recently had to make the shift from DLGuard to something more robust. Specifically, I needed One-Time Offers (Upsells and Downsells). My choices were grim. I could pick from 1ShoppingCart’s limited solution, InfusionSoft’s limited-and-expensive solution, Ultracart (which is really an ecommerce cart) or Butterfly Marketing (support is non-existent).
I chose Nanacast. Never heard of them, eh? Well, their features and benefits will blow you away. Check out my nanacast review. http://www.nanacastreview.com/