Where in NJ are you? I periodically see mobile sawmill services on CraigsList and this is one that I recall. https://www.mobilesawmillnj.com/
If you can transport the log and are in northern NJ, this might be an option. https://ludolumber.com/what-we-do/

I have not used either service but I have been thinking about it myself. I have three white oak logs in my yard and am trying to convince myself to use my chainsaw mill. If you end up using a service, please share how it goes.