I bought out an old collection from a local gentleman, and he had a big pile of Rabbit Springs Geodes from here in Idaho.
The agate in these do flouresce under an ultraviolet light, mostly green.
There are some whole ones, but most of them are pieces. I put a gatorade bottle in the photo for size comparison.
50 cents a pound, until they are gone.
I can only fit about 20 pounds into a flat rate box.