Find clip to Walther P99 air soft?

I am going to buy an air soft pistol on Amazon in a couple of days. The gun is a "Walther P99 spring Powered Airsoft Pistol", the famous 007 gun. Naturally I want to buy a couple of extra clips to this gun. I have searched the internet but I cant find a clip to this weapon, all i can find is a clip which holds gas and that doesn't fit in my gun. Please help me find somewhere where I can buy an extra clip online.