Any help where to look or who to talk to

hello i own Razer BlackShark V2 | RZ04-03230 headphones with the usb? i was wondering where i can get a replacement usb? sound card? i have lost it on my move to a new home. i hold this headset dear to me and i dont want trouble of replacing my headset. this was gifted by my uncle, who had a huge love for gaming. till this day i still wear this headset proud and prosper proudly with gaming! any help would be greatly appreciated <3