Where can i find a AGM L96 magazine?

i plan to get the AGM L96 airsoft sniper rifle. from http://www.airsplat.com/Items/AR-AGM-AWP-002.htm . and i was wondering if i could get an extra clip for this gun. i googled it and it gave me a link back to airsplat, and i clicked put in cart but when it goes to the cart it is not there. does anyone know where i can find a magazine for this gun?