2004 Pacifica timing belt
 

As you can assume from the title of this post I have a 2004 Pacifica. The timing belt went on it a week ago, and as it turns out, I have the 3.5L interference engine. The car is in great shape otherwise and has always been taken care of. I am not in a financial position to put the amount of money into it, that it would cost to fix the heads. I was wondering what people thought would be the best direction to go with it from here. It has been posted on craigslist for a few days, but I have not had any responses so far. Thanks!

You're not going to get much for a 10-year-old non-running car, but there is somebody out there who will buy it if the price is right. Whoever buys it will need to put some substantial amount of money into it and will still have a 10-year-old car.
At this point, your only real option, if you can't fix it yourself and can't afford to have it fixed, is to start looking for a replacement vehicle you can afford.
Chalk it up to tuition in the school of life, but learn a lesson about timing belts: Better to replace them before they break.