Tescos have a Towbar mounted Bike Carrier that carrys 3 bikes and is only £20. Bought this yesterday as needed one quickly and to be honest, it has exceeded my expectations, especially given its only £20. The plastic parts that the bike frames sit into are adjustable either backwards and forwards or left to right and then hold the bike with a rubber strap. This is very handy with modern bikes as the frames are not horizontal anymore. Lots of adjustments to hold any bike. All in all for £20 its pretty good. Solidly held 3 full size mountain bikes no problem, just put them on and strapped them together. Don't think this is an offer price or incorrect price, just a cracking price for what it is.