1999 Mark Mcgwire gold coin~highland mint~400 hr's nice

This Mark Mcgwire highland mint coin commorates his reaching of 400 homeruns with the fewest number of at bats (4,726). It's a limited edition #49. Comes with certificate card and case. I have searched ebay for this many times but can't ever find it, Tfor I would call it RARE! I really don't remember how many they made but for some reason 400 is stuck in my head. Thanks