Try in *Kitchen Craft* in B-Ring road , Near Al Handasa Building
You may find it at shops that sell cutlery items. LuLu is one of them; Carreffour is another. I agree with Shafna that they usually come in sets and not individual sizes. However, just give it a try at the above places.
I dont think it comes alone . It comes in a set. You can check it on the ikea website before going to store. I hope they will have it.