I need help paying for a root canal.

I am 25 years old & this is my first experience dealing with something like this. I don’t know what to do. Long story short I need 2 root canal’s and my appointment is scheduled 12/11. I have about $1800 to my name and the operation costs $3000. (2 procedures, crown, x-rays) and whatever else. I’m insured through my employer but I’m only allowed $1000 per benefit period & have already used about $600 of that on standard appointments this year. Here is my problem. The place doing the operation is a “pay for service” establishment. I have to have the whole $3000 up front before they even look at my mouth. But I need this done. I have a single credit card but it’s maxed out rn. Can’t go to parents. Any advice appreciated.