If you get on torsearch or similar tor search engines, you see ads for similar stuff. You also see links in forums and such for places selling what you want. These are the types of prices the ad's themselves claim. Is the author taking all those numbers at face value? Or is this some more in-depth research where it was possible to purchase one or more services? If it's former, I don't find these numbers to mean much.

The links can be dead by the time you get to them. You don't know if it's just another honeypot. You don't know if you'll get what you pay for.