An awesome way to get dried acrylic paint off of your hands and out of your paint brushes is hand sanitizer. Inexpensive.
For paint brushes just work the brush back and forth in the sanitizer. For stuck in, deep, dried on paint, spread the bristles apart, and work the sanitizer in with your fingers.
Hmm. Since hand sanitizer seems to mainly consist of isopropryl alcohol, which is about $0.50 per bottle, that might work, too. I've never tried it, though.