According to those same sources, the listing price just doesn't seem to be in line with the real value of the property.  

My post is only my opinion unless I am citing a source or using quotes.

If your investment is good then it is a good source.

Is anyone aware of a site or source that one can review to see the results of those investors engaged in wholesale activities?

Have you already purchased this property: Yes, the property has been purchased by a foreign investor who we are doing the work for.2.

One of my best sources has been the gals at the water company, and city code enforcement officer.  

Are foreign investors buying property?

My experience here in SW Michigan is this:- there are no true wholesalers in this area that produce enough volume that they can be considered a real source- if you want deals you'll need to market for them yourself; the others are keeping their leads to maintain their own business- I've heard from a few pretenders claiming they're wholesaling- make sure you check up on their claims, see if the properties are already listed, etc. 

You are in NJ where you cannot discriminate based on source of income, and a Section 8 voucher is considered a source of income.

Listsource.com, Agentpro247.com is another source.