To check whether a site is legit,I suggest you to follow a simple checklist to see how well they do.
1) Use WhoisXY.com to check the whois information and check whether the contact information matches with the one in the website.
2) In the domain contact details, is there a valid email address.
3) Is there a valid phone number visible, and does it work?
4) Go through review about them using Webutation.net and check whether they are scam free.
5)Does the site have a current SSL certificate?

If you get satisfied with the above conditions then you can proceed to checkin for a low priced article and based on their safe and prompt delivery you can purchase your desired product.In your case you can follow the same process and if you get any negative response you can proceed legally with the purchase receipt and other process details that you have went through..