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Sorry. . . but I guess not. I was fooling around on the internet once looking for prices, and I did come across one site which sells them . . . which I conveniently forgot. (But then again, it might not be reputable.) Try googling it.
I don't know of an online store, but the PetLand in Ft. Walton Beach, Florida carries them. They have had them the last few times we've been down (Christmas, and just a few weeks ago in April).
Phone number is (850) 796-2424.
I know it's not exacty what you're looking for, but maybe a starting place.