I've seen 20 round mags for Canik's but never a 30 rounder. You can get on the notification list at Mag Shack for when they're back in stock. I've done business with them, no problems.
The 30 rounders are made by ProMag. Canik OEM mags are made by Mec-Gar. ProMag magazines are not typically as dependable as Mec-Gar. Fine for range use but I wouldn't depend on them for daily self-defense. YMMV