you dont have to go anywhere....this is will cost more than requesting the invitations, designing and printing them...
take the Gulf Road heading to the Jiddah bridge, after passing the Mannai R/A, look at aljazeera Hospital, its just opps. to the other side...
Very old shop, but they are making a very good designs, and a good quality print...start from 0.25 QR-50.00 Qr
im not working there, and its not mine, but i have been there. its really good guy who is working there...
dont ask me about the name because i really dont know, I forgot.
good luck