I can't know what country you are in but here we have:
samsungparts.com
shopjimmy.com
ebay.com
Also, a decent electronics tech might craft a new cable. It's a little more rare today but as a tech long ago I made countless cables over the years.
Hi, so recently my Samsung un55c700wf died. It would just click. I opened it up to discover that the connector on the powesupply board that holds the cable going from the power supply board (BN44-00376A) to the main board had somehow burnt. I bought a new power supply board but can't find that 18 pin cable that connect the two boards anywhere.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic