Mark,
Mercian Cycles in Derbyshire provides this quote on their website:
*USA is currently working out at £55.00 shipping, plus £25 insurance fo r a frame, using Parcelforce International Airmail, which usually takes 5 - 10 working days from despatch to delivery. * ** That's about $100 + $45.
If it's much more than that, the seller might be bumping up the shipping cost to cover his time & effort.
Good luck!
--
Andrew Conway
Arlington Massachussetts, USA
http://www.velofellow.com