Yep - i'm afraid import costs are pretty high. It's in the region of £70-80 on a Kifaru G2 Zulu & E&E - the items themselves were around $400, shipping was $70, Royal Mail add about £8 for processing fee, then you have import tax and VAT.
Clearly, the more expensive the item, the more you pay in duties/taxes. I would also imagine that a tipi made by Kifaru would be built to withstand a small nuclear explosion so I bet it isn't lightweight!
Unless you really, really, really want one, I would suggest looking at some of the alternatives that are frequently mentioned in these hallowed pages. I remember many 'What Lavu/Tipi?' threads.
Just do a search. You may find that even though some look expensive, you'll still be spending less than on importing a Kifaru.
I should point out that I'm not trying to take business away from Kifaru, as their stuff is great quality and very functional; however, I'm sure I haven't been the first to take sharp intakes of breath and a short sit-down when getting the invoice for the gear and then, a couple of months later, the invoice for import costs! :Wow: