SAW Ammo Pouch

[disasterarea]

I picked up an A&K M249 recently, mostly as a display piece. I'm looking to replace the oversized box mag that comes with it, ideally for cheap. I have stubby arms and I can't hold it properly with the standard box. I know there's some functional options like the MAG nutsack pouch, but since this is for display, I'd like to save some cash and make it look more authentic by adding a dummy belt and a bag to it. I know ArmyIssue sells 20rd belts, so that's not an issue. Finding a surplus (or not) pouch is proving more difficult. Anyone have any suggestions on where to look?

For clarification: I mean a soft ammo pouch like pictured, not a pouch for the box mag that's already on it.

[ThunderCactus]

It's referred to as a nutsack, and it's the "100 round pouch" or "1000 round pouch" for airsoft
Pretty sure they are readily available for CA style 249s, check ehobby under auto loading magazines

[McCrea]

You can add a dummy belt on a airsoft nutsack to hide the feeding tube very easily..