I was at the nursery today, and they were selling coco fiber mats on a roll for about $1.50 a foot. It's meant to go in the bottom of large hanging wire baskets, but I was wondering if it could be used for a viv? The stuff is about 1/2" thick, and kind of flexible. Well, not stiff anyway. Still, it's a lot cheaper than most viv sites sell coco fiber mats.