You can order from their website. I think it's RTS sportsline or something like that.
I've done it with pretty good success: only a few shipping difficulties.
The last batch (they do take a while to get here) was labeled my size but I couldn't get them over my knee....so be forewarned, you lose the chance to easily return things if you go for the lower european price!
I placed an order on the RTS-Sportline website at the end of May. It still has not shipped and they told me this past week that they need another six weeks to fill it. They are looking for a new material supplier to make the material as their current one is in bankruptcy. The prices on the site are good, however. Two of the breeches were on sale for $115 USD, the other was $144 USD regular price. The shipping was $46 USD and I think that is the same no matter how many you order. I am a little nervous about the material with a new supplier, but I decided not to cancel the order just yet.