I'm in a similar position, and after looking at all the options it looked like the best course for me was to take a few classes in a non-degree program and apply to schools that have flexible options for non-degree applicants (i.e. don't require a related BA and allow you to complete some of the pre-reqs as you apply, the summer before matriculating, and/or during the program). This way I can take just 1-2 courses per semester while working full-time. I'm going to try to do as many pre-reqs before applying to MAs as possible just to save money (as it'd be much more expensive to extend grad school an extra semester or two) but also not pushing it, because I want to do really well in them. Took my first prereq online at ENMU because it is the cheapest, but wasn't super thrilled with the quality, so am taking the next one at my local state college. For the rest I'll probably do a combination of my state school and online, depending on the course.
It sucks that every school wants different prereqs. I made a spreadsheet with a bunch of schools I'm considering and listed out which prereqs they each want. I'm prioritizing the courses that are most common across all my schools. There were about 6 courses that were common in almost all the schools I'm looking at (Speech/Language Acquisition or Development, Phonetics, Communication Disorders, Audiology, Anatomy & Physiology of Speech and Hearing Mech, Speech Science) so those are the ones I'm aiming to take.