Picking a manufacturer (Samsung) and size (32") at random, I see the smart TV for $499 and non-smart options for 219, 269, 299. http://www.samsung.com/us/video/tvs/all-products
Just for example.
Just for example.
The Smart TV even without the "Smarts" are generally higher end TVs.
Though not indicated on the main screen the $299 option is actually a SmartTV if you click through. You have to get down to the $269 option to get to non-smart TV.
The difference between the $269 and $299 seems to be about the difference for putting a processor in a TV and making it smart....
(Note I don't make the claim that the SmartTVs are cheaper but for the most part its being absorbed in the cost of higher end devices so you get the Smarts "for free" on better sets)
The cheapest 50" TV they have is $799 has interactivity. http://www.lg.com/us/tvs