Take a look at how the United States searches for their porn, and be shamed and intrigued at the same time. Just like when you masturbate!
If you want to practice 17th century Icelandic magic (and really, who doesn't want to?), you're going to have to find a friend and make a deal with him so after he/she dies you can dig up the corpse and use their skin for some necropants.
Or, if you want to bag the whole 17th century Iceland magic thing but still have a hankering for human skin, you can check out this site. But be warned, it's plenty pricey! (And also quite possibly illegal.)