I installed the module from Webelectricproducts. Less than $30 shipped.
Works perfectly, and will fit in the cavity below the window switch. I wrapped mine with foam to prevent rattles.
If you have an '00 - '04, you may need to run a ground wire, which was not very clear in the instructions. The metal in the door panel is not grounded. I had to remove the door panel to find a good ground. Once I had the panel off, it was just as easy to run one from behing the passenger side kick panel.