Let’s face it, it’s easy to spend quite a bit of money on your home recording studio. A decent monitoring setup with a nearfield system can set you back over $2000, and that’s not even going to be the first, or last, expense. If that’s out of reach for the time being, consider using a pair of quality headphones to do your mixing. A significant portion of consumers listen to music or other audio via headphones. Since there is such a different stereo profile for speakers and headphones (about 60° versus 180°), it would be a disservice to your product not to at least listen through with both.
You can read more on the topic here: http://audioundone.com/headphones-and-mixing