Buy IDW Comics outside the US

[KatonRyu 1,026]

I live in the Netherlands, but I'd still like to read the IDW comics. Even though I've managed to find most of them online at least one of them, the Holiday Special, has eluded me. Does anyone know where I could buy it? I checked the IDW site but that particular one can't be purchased online for some reason.

 

I really want to read it because ever since Rainbow Rocks Sunset has been one of my favorite characters. I believe the nearest retail point for IDW is somewhere in southern Germany, which is a bit too far for me to travel to. Thanks in advance!