Do you want a NET to stop things sliding around, or a cover to 'cover' the cargo area?
If you want a cover, look at the post from ABPC1.
If you want a net, you may be out of luck.
If you want a Chrylser Tote similar to this...
http://www.moparsupercenter.com/carg...8.html?cat=116
I have one I'm selling - make me an offer (shipping is about $9)