New Wholesaler asking me to sign Non Disclosure agreement

[Robert M.]

A wholesaler approached me about a group of properties that I may or may not have interest in purchasing.  I do not know this wholesaler and they approached me but they want me to sign an NDNC agreement prior to releasing the address for me to inspect.

Further, I asked them to send over their NDNC and they dont have and asked me to find one and send to them this morning.  

I am on any buyers list and have properties sent to me everyday to evaluate.  I dont think I have been presented these properties because of the area but, if I have been presented, I wish to remain loyal to first wholesaler and avoid any trouble because I signed a NDNC.

Thoughts or Suggestions?