Found these instore last night. I would assume they are left over from the Baby Event. The Tommy Tippee versions were £10 but next to them were the Avent Manual Breast Pump at a clearance price of £3.67!!!!
They had quite a few and my OH thought for that price she would have a go when our baby arrives!
Having a quick look on the Net, the average price seems to be around £15-20
Edit - This was in the Chelmsford Store