I have two Western Digital 500gb 2.5" SATA internal hard drives for sale. Still in their anti-static bags. I bought these to enhance two laptops and for unrelated reasons will not use them for that.

Note that these are not standalone drives, but designed to be fitted inside a laptop.

Not sure of the price at this moment, but I'll sell them for what they cost me in the US.

You can purchase USB housings for these at Fultec (I'm sure others have them) for about $50bz and then these become ideal portable external drives. I did this to the two that were in my old laptop and use one as additional storage and one for backup.