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I believe liveaquaria.com has some, but I'd try the LFS too. They often have plenty of'm laying around. That way you can hand pick the sizes a little larger than the one's you've got. On line, I'm guessing you'll get some huge ones that can't be used for some time IMO.
hopefully ........ the guy did have a 100%positive feedback
ahh either way it will be fine, My wife is just freaking out about them dying because they don't have a bigger shell to move to. they are mainly to keep her quiet