I know that this isn't exactly what you asked for but the one rental place in Boulder has them really cheap and includes a trailer. I think it was $600 for 8 days. Most of the other rentals do not include a trailer. We couldn't find a company to drop off and pick up so we just trailered it. It worked out cheaper and easier since we were able to load all the food and just roll it off into the river.
May the wind be always at your back,
May the sun shine warm upon your face.