where to sell used cars

I have been listing my used car (2002 Chevy Prizm) for sale on craiglist.org and autotrader.com. I am the original owner and the mileage is 87K. Surprisingly, It has been about a week, but I have not got a single phone call or email message.I am in the east coast.

I wonder nowadays where people sell their used cars besides trade-in. Because my car is in so good condition, I decided not to trade it in when I purchased a new Lexus.

Thanks!