Refurbished iPod from Apple Store UK

Apple Certified Refurbished Products are pre-owned Apple products that undergo Apple’s stringent refurbishment process prior to being offered for sale.

iPod shuffle 1GB - £34.00
iPod nano, 2GB - Silver - £52.00
iPod nano, 8GB - Black - £99.00

*Save up to 48% off the original price

Apple Store UK

Those are the ones they take back when you approach them to get the battery replaced. They refurbish it and sells it for 52% of the price. The battery replacement is done for almost like 75% price of original. So it is good business for them both ways.