I think that the only true 'split' coins here are by Roy Kueppers in "halfs" and "quarters" and by World Magic Shop (various other coins).
Candidly, I've never even seen a walking liberty split...that would be cool. Good luck finding one ;-)
I take that back...Roy has one on his site. Here's the link:
http://www.roykueppers.com/othercoins.html
Good luck.