Non-profit organization, IRB Approval, and publishing?
Most reputable journals in fields that involve human subjects research require that authors state (often in the article itself) that the study received approval from an IRB or the national equivalent in some other country.  

As researchers that aren't affiliated with an organization that has its own IRB, you're in a bit of a bind.  There are independent Review Boards that can be contracted to provide oversight of research conducted outside of a normal institutional setting.  These are used for example in some drug company sponsored clinical trials.  You would have to contract with such an IRB to have your project reviewed and supervised.