Cost me £55 for a new one for my VW Bora recently at Partsco.
Halfords and the local VW dealership wanted around £80 when contacted over the phone for prices, so Partsco naturally got the business.
By the way, the battery being replaced was the original factory fitted item.
Its age? Eight and a half years, so it doesn't owe me anything.
The exhaust is also the original and is still in good nick.
Original equipment parts always last far, far longer than replacements.