Adding accesories to your laptop

Greetings All,

I am interested in adding some accessories to my laptop. I have an Inspiron 1720 that I like a lot. I want to upgrade the CD/DVD drive to a blue ray drive. In talking to a tech online, he said the change is quite easy, with the use of only one screw. I checked the back and can see what he means. I have added a second hard drive that I am enjoying. Dell has made these changes relatively simple.

What I am curious about is where I can purchase one of these optical blue ray drives. I have looked for one that will work on my 1720 but did not find one. Does anyone know where I can get a drive that will fit my computer? Also, does anyone know of a 7200 rpm hard drive larger than 200 gig that will fit this computer?

Thanks for any information you can offer.