Neem Oil Bed Bugs

Recently my friend found signs of infestations of insect of bed to his house, and I went online and did some research and it seems the Oil of Neem is the manner more sure and the most effective one to treat them. The thing is that I mets't knows any products that contain, therefore if someone could help is located me does not import although I can use that the content the Oil of Neem to rid of these insects of bed or gives me an alternate other. I looked for Google and Yahoo but am broken links without report of my research. Thank you in advance.

You can buy it online:
http://www.planetnatural.com/site/neem-o...
http://www.amazon.com/dyna-gro-neem-oil-...