Found this on Centrecom website. Stock available online, Clayton and Frankston VIC. It's good choice since used on ebay are arround $50. I got mine from Clayton store. The sales person there amazed since RRP is around $80. Good option to upgrade optical drive on laptop or put it on drive enclosure to make it removable bluray.
Edited: I can confirm that this unit fit perfectly on Thinkpad E520 and L420. Any other laptops that use similar drive will be able to use this one as well
BURN DVDS, READ BLU-RAY DISCS
Enhance notebook capabilities with the LG CT21N Slim Blu-ray Super Multi Combo Drive. Read and write in DVD and CD formats with the additional feature of accessing and viewing Blu-ray discs. SATA interface technology allows for easier integration andultimately faster performance. Burn fast, burn right and read blu.
So only reads Blurays