shops can charge what they want the bigger the firm can charge less as they can buy in bulk must admit you must be gutted is it to late to take back

Sorry you paid so much but prices do vary greatly. Advice for the future -
Look around the stores - if you see what you like get the price, also check make and model number.
Go home and check on the internet - on one of the price checker websites and you will almost certainly come up with a much cheaper price than you saw in store

It's called market forces mate. That's what you get for not shopping around.