D-link dwa-140 should work fine.
Last time i checked, they were around $20-$25 on ebay, which is a lot cheaper that the Samsung rip-off dongle (which in essence, is nothing but a re-badged DWA-140!).
Make sure you check the version of the D-link DWA-140 before you buy. I bought the B2 ver 1.71 and can't get it to work on my Samsung tv.
Any that do not need to install software to use. They're rare but they're out there.
Be aware tho they may use a "proprietary" Usb Adapter like the X-Box had and the 3rd party adapters may not work.
ahsan shafiq ahsan shafiq
The main differences between the two series are some added functionality as well as design changes . The extra features are not really enough to justify the price hike.