Amazon have a number of Toshiba HDWC130EW3J1 Stor.E Canvio 3TB USB 3.0 3.5 Inch Desktop Hard Drives in their used section for £42.62 - used but "very good condition" or "like new" for £44.50.
A great price for backup and storage.Pre-loaded with NTI® Backup Now EZ™ software and backward compatible with USB 2.0
These are usually items returned by buyers who have changed their mind and have returned them to Amazon. I have purchased a number of similar items in the past and have not been disappointed yet. In most cases I would not have known they were not new. They come with the Amazon 30 day return policy so there's little to lose.
Because of its capacity it uses a supplied AC Power adapter cable - but all drives over 2TB do anyway.
They do come in an awful black/white colour combo but for the price I can live with that. In any case for those wanting to take the SATA drive out of the casing and use it elsewhere it won't be a problem.
Mine will be used for backup and looking around it's an awful lot of storage a very keen price.