It's like most things really, you've just got to shop around and calculate the cheapest way of buying. Jason from JeepinOutfitters I felt was very reasonable in his shipping charges.

The main thing I have to take into consideration is the exchange rate. In 2006when the exchange rate was in my favor, it was great!
I bought 4 Cragar rims for about 330 and the shipping to the UK was about 170. Yes, thats a lot of shipping cost but when it was exchanged into Pound Sterling, the total of approx 500 was still 75% of cost of the same 4 rims in the UK.

The exchange rate isn't so good now So anything I need, I need to calculate whether it's cheaper to buy in the US and get it shipped over or to buy in the UK.

Jeep stuff is very expensive in the UK because everything is imported. But then again I suppose that Land Rover and Range Rover parts are expensive in the US, whilst over here they are dirt cheap.