where do you get ISO 9241 certifications?

There are lots of companies/agencies provide consultations and certifications on ISO 9001, but I cant find much about ISO 9241 certification/verification services. Where should I look for it?

I understand there are agencies who got permissions from the ISO to issue the certificate, but I just can't find ones that do ISO 9241 yet.

For a desktop application(windows/Mac) that is used for a 3D modeling and printing, which part of 9241 should I be applying?