I've just noticed Harddrive prices are falling again. And Seagate now have a 750GB HD selling for around £189. This has led to 500GB HDs dropping to below £100 with a 500GB Seagate for £97, a WD for £92 and Samsung for £98.
This means that for under £200 you can now purchase two 500GB HDs! 1TB of storage for under this price was unheard of last year. Great news for retro gaming collectors!