I have a set of BMR Fabrication bars for sale for $180.
http://www.bmrfabrication.com/C5.htm. The bars are solid and are 32mm front, 19mm rear. The rear is the same diamater as stock, but being solid it reduces body roll 50% over z51 and is comprable with the Hotchkiss setup. The pic on their website shows the wrong bars. These are black and look the same as all other C5 bars. Comes with polyurethane bushings but no end links.