25GB Blu-ray BD-R, 25-disc spindle, $65 ($2.60 per disc)
 

I'm not one to suggested "house brand" (brand X) blank discs, but sometimes they can be good for testing. I'd rather waste an unknown-quality $2.60 blank than a high-quality $10+ blank, when I'm trying to learn new tech.

Are you learning how to burn Blu-ray discs? Then I suggest you buy some cheap test discs.
Get yourself some of these:

• http://www.mediamegamall.com/mega-me...5-p-17984.html

25GB Blu-ray BD-R, 25-disc spindle, $65 ($2.60 per disc)

Good store to shop from, prices are outstanding. :)