Dish Network to extend free Sling Adapter (after rebate) offer to existing customers

Dish Networks recently revealed a promotion involving free Sling Adapters for new customers, but now Scott Greczkowski of reports they will also be available to existing customers after May 18th. The Sling Adapter will cost $99 up front, with a rebate for the same amount coming back as an AmEx gift card. That's a nice treat for all those still looking to add some Sling capabilities to their 722 DVRs, and apparently it's a response to customer feedback. Check the forum for all the details, but we're pretty sure "free" (even after rebate) is really all the detail necessary.