Star diagnostic scanner

Mercedes » S-Class » 2000-2006
Problem Description

I need help finding where i can buy a legitimate star diagnostics scanner. I've found some on eBay and stuff but I'm told buying those are probably clones and I won't be able to continue my yearly license and access to WIS,EPC, XENTRY and so on. Does anybody know where to find a legitimate star diagnostics scanner. C4 or c5 is nice but c3 will do.
And also any other laptops that work with it