H&R's for Explorer Sport

[arttyszka]

Hi guys, I see on the H&R website that they now have an Explorer-specific part number, 51630, I had thought that everyone was using the Flex spring on their Sports.  Does anyone know of a good mail-order source for them?  LMS isn't carrying them yet and I have to believe I can do better than list price on H&R site.

Thanks
Art