The very "nice" read "expensive" pond store here sells mosaic plant - the type they have actually has more redish tones to it - it IS gorgeous! I first saw it last year, but when we got the pond equipment about a month ago, they didn't have any this year yet.
Their catalogue says last year's price was 3(very small pieces) for $25, or $10 each!!!
I do think that's a bit much for something that probably won't survive our zone
6 winters here either! It also says that "Unfortunately Koi find this plant to be a culinary delicacy"!!! Guess I really won't be having any of these pretty plants, as I really really want a couple of koi!