That is a big issue. I've been working on a kickstarter project and they are losing their shirts on international shipping. What really gets you is the customs and duties handling fees. The flat rate box mentioned earlier isn't going to work, because of your form factor, which is a big issue. Since most international frieght is based on dimensional weight, the size of the box, which yours is going to be long.
What you might want to do is find a distributor in Europe and send them a crate over the ocean and then have them send them locally, it cuts costs on customs also, since you only have to deal with a single large shipment. There are fees for each shipment for customs.
I had an ecommerce company and we stopped shipping to canada because we'd lose on every shipment and nobody ever wanted to pay the true price. The rest of the world was even worse.