www.xe.com has good conversions.
Haven't had any problems so far with shipping to the US. So far the largest shipping bill has been $17, that's a shipment of 3 model kits and a bunch of misc (two wheel sets, epoxy putty, masking tape). Even with shipping added, in the end it still ends up cheaper than ordering from online stores in the US (recently got hit with a $9 charge for one kit) since most online hobby stores in the US like to jack up shipping and handling.