A:
The WIS08AB LinkStick is no longer available for sale, unfortunately, and the new Linksticks are not compatible with the A650 models.
Either a wired connection, or an Ethernet bridge would be the best way to connect your TV.
Many of the Blu-Ray players on the market today are wireless, and have a whole new updated Apps platform for streaming movies and services that aren't available on the A650 Series television. For the same price of a wireless bridge, you could almost get a new Blu-Ray player and have all the Apps features play from that device. It's an option, but you can also talk with your Best Buy salesperson for more information on both options.
Thanks for your support of Samsung products.
--Mr. Samsung