If there's something like a Hobby Lobby near you, they would have a section near the models for diorama's. Such things as snow and water kits, desert, grass. The grasses come in various lengths. There are other supplies that would be handy too. This would be my first choice. This chain of craft/hobby store tend to have sales every day, a different set of items are on sale in different days. I think every thursday "home decor" items are on sale, which includes all glass things, wood items, etc. Models and diorama stuff might be on a wednesday. Typically 30% off (at least here it's like that). Check their web site for info.

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