There are directories of distance and online programs which are not the same btw, like Petersons/NUCEA.

Look for a school that will accept the credits you already have, like Indiana University. Most programs will require that you take a minimum with them, e.g., 30 semester units.

The subject of the bachelors is not important in the ESL trade, so anything would do.

I just found one at City University in Bellevue Washington. Requiring 180 units but they will allow you to transfer 135 units from other institutions. It is available online or in-class.

http://www.cityu.edu/admissions-financialaid/admissions/tuition.aspx

This page tells the tuition fees per credit. It sounds to me like they go by the quarter system, meaning unfortunately that each course will cost you at least 5 x 340 USD. I paid about 600 per course at a different school a few years ago, but schools are changing.

http://www.cityu.edu/programs/sas/as-general-studies.aspx

I heard of an IT degree being offered for about 7000 USD.

There are also certificate programs that you can get online for cheaper through coursera.org or edx, if you need to work up in smaller steps.