I want to buy a 750GB SATA HDD. It needs to be working and must have no bad sector. I need it for a RAID 0 config. Please, mention your lowest price.

I also need another SATA HDD having storage space in between 320GB to 1TB. It needs to be working and no bad sector of course. Don't care if it's from a laptop or desktop. WD/HGST preferable. HDD with the lowest price/GB will be considered.

Thanks in advance.