I have a set of the wheels from Modeltech their mailorder service is great.
You need to remember that although VAT is charged at 17.5% in the UK where prices are quoted as including VAT the deduction for overseas orders will not be 17.5% it will be a bit less.
To explain: If the price including vat is 1 dollar then the the pirce without vat will be just over 85 cents ie 85cents plus 17.5% =1 dollar or near enough so the actual deduction you will see is around 15%.
The wheels are 5.99 sterling here which at current rates equates to $7.34 a pair if you remove the VAT.
I also bought some inserts from there these are fine but they are made by Integy so I guess you can get these locally anyway.