In the past, Sony offered bundles when their first 4k media player, the FMP-X1, released last summer. We’re hoping the $200 discount for the X10 might return soon in some sort of package deal with a new 4k TV from Sony’s XBR Series. (You might also try shopping for the X10 from other retailers including Amazon and Best Buy.)
As of now, Sony’s Video Unlimited 4k service (accessible via the X10) provides the most expansive library of true 4k content with titles such as Moneyball and The Amazing Spider-Man to rent or purchase, and 50 free videos pre-loaded on the X10. Other than that, 4k options are limited: Netflix is streaming House of Cards and Breaking Bad in 4k (the X10 supports the video format); and, anyone with a compatible 4k camera can view their own self-produced videos on 4k TVs.
The X10, unfortunately, is only compatible with Sony Bravia 4k TVs that include the XBR-X850A, XBR-X900, and XBR-X900A. Be sure you have a compatible Sony 4k TV before purchasing.
You can get more info on the FMP-X10 in this comparison of the Sony X1 and X10 4k Media Players.