Unless you absolutely need an internal one, I'd suggest just getting an external drive and be done with it.
I'd vote for that!
To satisfy my curiosity I checked on the price of Blue-Ray external drives. They are available in Australia for less than 100AUD. I'd expect that a replacement internal drive - if available - would be significantly more than that. Without knowing your intended useage of a drive with write capability, there's also the convenience of having two drives if you are copying disks.
Research the internal option by all means, but an external alternative has a couple of advantages to offset admitted hassle of having to carry it around all (or some) of the time.