Mmm.. well, the PicoPSU is normally about $50 by itself, and a suitable +12V brick should be fairly cheap. 60W should be enough: figure 30-35W max for the motherboard with CPU running flat out, and then (overkill) 5W per drive.

So a 60W brick should do the job. www.mini-box.com sells the PicoPSU-120 with a 60W brick together for USD$55 (total!). Or you could save a further $5 by getting the same brick with a lower-rated PicoPSU-90 for $50 from them.

They do ship internationally, though the cost may be excessive since they're US-based, and many places in the US don't seem to offer AirMail as a shipping method. Quite odd, that.

EDIT: Yup, they fall into that category: $118.25 for the overkill of UPS Worldwide Express to Norway.

Or you could have one of us pick it up and bring it along to the 10th Birthday party for you.

Cheers