I was just browsing a science supply site and came across a Right Start-style AL Abacus in their clearance section for $7.50!
Just thought I would share, even if some are just interested in backups!
http://sciencekit.com/horizontal-abacus/p/IG0029229/
Here is the official RS Abacus for quick comparison:
http://store.rightstartmath.com/manipulatives.aspx