Are there any official Mother Talzin collectibles out there? Hasbro made a generic Nightsister figure that looks similar to, but is not her. WOTC made a Nightsister / Sith Witch miniature that looks similar as well, but isn't her...
An eBay search only turned up the Topps card LAJ mentioned, as well as the Hasbro Nightsister figure. It doesn't appear that there's any official merchandise out there at the moment unfortunately.