Sagecoachdriver, search craigslist and others for USED towbars etc. May even find baseplates. $1000 units can be had for around $200 normally, same for brake systems.
There are some salvage yards (1 in Yuma) that has used parts and is reasonably cheap. Another is to watch CW for their sales but they tend to be $$ even then. My unbit came with the tow bar and accessories, so we had to order base plates. Got mine at CW when they had $29 install. The parts were about $150 more than could be found on line but then would have had to downtime the car for me to install or go to someone who charged $75-100+/hr to do the work. So take your time and look to see what is avail;able out there and do an expanded search to your surrounding areas. There are some online places but I have not ever used or rally looked at them. Maybe someone can give ya a link to them: here is 1: http://www.rvnetwork.com/index.php?s=707c94e9854ca18d750d65b4e3a88ad7&showforum=37