If a company is selling something for a price that seems way to cheap and they claim to be a Partner or Reseller for a big namebrand company check if they are telling the truth.

Microsoft Partner Network

https://partnercenter.microsoft.com/en-us/pcv/search

Dell Partner

https://dell.secure.force.com/partner/spf__partnersearch?c=us&l=en_US

HP Reseller

http://www8.hp.com/us/en/store-finder/find.do?type=reseller