Hello Sir,

So you want to cheap it?
Well, I think I'm one of the bigger experts on doing things on the cheap...
You could always save you BIAB accompaniments on a CD as a Wav file, put them on a CD and play them through a boom box/stereo???

Also, I have a set of Sony self-powered speakers from 1986 that have been through 5 overseas tours. They work pretty well with a desktop/laptop.

This might still be an option if you have more "modern" speakers that are blue-tooth...

Just some suggestions.
Good luck!!!