We have one only payed around £18 delivered, used it for the 1st time a few weeks ago, we bought a 2 berth which fits a double airbed no problem, nice and warm too which was handy as all it did for the week was rain.
The only problem i found was that you could only fix it to one side of the awning poll, the other side we had to fix to the middle poll with string.
My falt it does say on the box additional fixing required.
We use one and use bungees to secure, reason being the kids are prown to either pulling on the walls by accident or falling through the door and grabbing it! The bungees allow for some give, when we used the cords they nearly managed to pull the awning down! Less strain too on the poles.
Wendy
------------- Animals are my friends... and I don't eat my friends...
George Bernard Shaw