Not sure of cheapest but you may run into dealer contract problems with the manufacturer. Many bike dealership contracts list conditions such as no internet sales outside the dealer's defined area. Also no exports to countries where they have distributors.
Try an internet search for dealers for both brands and see if intenet sales and foreign shipments are listed. If not covered then an email to the dealer might help.
I did a generic 'find a dealer' exercise on Specialized's site. There are 20 dealers in the UK. I tried using Trek's dealer locator, but it just kept finding the two in my town (even after changing from the US to UK sites).
Originally Posted by Cyril
Ride what and in what manner pleases you. Those that mind don't matter, and those that matter don't mind. srsly.