I'm turning my garage into a Home Theater and the biggest issue I have right now is my budget.

Second issue (and reason for this post) is I need to find out how to cheaply soundproof my garage door.

I'd like to set a $150 budget for the door. I listen to movies very loudly and with lots of low bass. I know I can't totally soundproof the door, but if you had $150 to spend, what would you do?

Thanks in advance for any advice. I'm posting another topic about walls as well.