Taiyo Yuden 50gb Dual Layer BD-R

Does anybody know here I can purchase a spindle of these? The 25gb single layer discs are around but I can't find the dual layer 50gb discs anywhere.

 

Amazon sells a 10 disc spindle.

 

I'm hesitant because under this listing for the 25gb discs, there's a comment that claims these discs aren't Taiyo Yuden discs at all.

https://www.amazon.com/Taiyo-Yuden-...pID=51r-VJIOowL&preST=_SY300_QL70_&dpSrc=srch

 

Two positive reviews for the TY BD-R DL discs. And, it's Amazon. Get a refund if they're coasters.