if you want to know if a site is legitimate before getting the stuff ,you should keep in mind the following instructions
1.Use Whois lookup tool like to check the whois information.Because legitimate company
properly update whois database.
2.Then check whether domain owner contact details and E-mail address is currently active or not.
3.Finally take some reviews about that company using Scamadviser.com,Webutation.net.
I am sure above the steps are very useful to check any company is legit or scam.I hope it will be very useful to you