Peter, this also caught my eye, so I asked about it. This is what they replied: "Shipping costs.
After we have received your order through the shop we can determine the volume and thus the shipping cost to your location. If you prefer, you can bypass the shop and send an email directly to us. Please state the products you intend to purchase and we will respond as soon as we can with information on pricing, lead time and shipping costs.
After that confirmation of conditions there is no change whatsoever in these conditions, assuming you place your order within a two months time frame!)."
So I understand that first I place an order, then I get an order confirmation, and then if I accept it within two month time frame, I pay the price mentioned in the order confirmation.
I am pretty paranoid about shipping costs since I have once ended up paying almost double just because the shop didn't bother to inform me that the item I bought didn't fit "regular" package.
Personally I would prefer that the postage would be calculated in the price. Simple, no fuss. I get annoyed when some shops try to keep the list prices low and then the final bill is something different.