I posted this link before, but this is the NJ Board of Public Utilities site that has information on the alternative suppliers:
Board of Public Utilities | Commercial<br />Customers
At the bottom of that page, you click on your current utility provider and then it will give you a list of the current alternatives that serve those areas and what they offer in terms of service as well as their contact information.
Here is the link for JCPL:
"Reliant" energy was listed, which I am assuming is the "Reliance" from your post, but "Commerce" wasn't, the list is updated as of 4/25/12.
If you are considering it, read the contract carefully and do your homework and I personally wouldn't consider a supplier that wasn't on the lists I linked above.