Michael's has a lot of Spring themed stuff including tons of new plastic plants useful for jungle terrain pieces. Further I saw these for the first time. They are kind of thick in height, but I'll find a way to use them as marsh land or rough terrain somehow. They are shedding badly so I'll mist on some thinned PVA as soon as the weather improves.
[Update 3/4/17 - now half off]
[Update 3/4/17 - Some of these were not here last time.]
[Update 3/4/17 - perfect!]
This, the largest piece, is about 12"x12"
The smaller one is about 8"x 8".
Maybe a terrible guess, but this is about 8" in diameter.