If you are looking in the medium price range we recommend the AJA cards.
If you're aiming for high priced cards you can use Deltacast or DVS (Rohde & Schwarz).

The specific model depends on how many inputs you want and do you work in HD or 4K.

For e.g. for 3 HD cameras + 1 HD output and mid-price we recommend AJA Corvid 44 BNC.

Hi,

I have one AJA Corvid 44 BNC that I am not using, I want to sell it, it is in mint condition and comes with orginal packaging.

Regards