In bulk the 128gb blu ray discs aren't nearly as expensive -- I picked up a 25 pack for about $230 18 months ago

The bigger problem is finding a drive that can read and write them -- the 128gb format support is a bit harder to find. I thought I would be good with my nice Pioneer BDRW drive but it didnt have the support so I had to buy an LG unit. So now my desktop has two BDRWs -- how very 2006!