Lake district wigwams can be found here:
http://www.discovercumbria.co.uk/Holiday-Tipi.html
Not so close to the stones though.
I'm sure there used to be a tipi-campsite in Langdale too, but can't find the link.

Or if you're after parting with 260-odd squids, there's always this:
http://www.touring-gear.com/eshop.php/department/department-id/166/wolf-camper-lavvu-tents-tipi-style.html