Alright, back to my third point!
I run a business renting radar detectors (as was stated previously), called Radars for Rent. We have five different models available that range anywhere between $40.00 and $50.00 for a 7-day rental (including all tax and shipping costs).
www.radarsforrent.com
This is a great way to try out a detector or two without making an outright commitment by purchasing one.