The answer to this question is not singular. Because Roller Derby was the most prevalent roller skate maker, and then carried that success over into Skateboarding during the mid-to-late 1960s, there are a lot of Roller Derby boards out there.
The factors that will make a Roller Derby board worth something have to do with condition, and rarities in the item itself, such as black wheels vs "clay red" wheels, whether it is a longer board -- anything longer than 28" is more rare. Like most things that are collected, finding the right buyer for the right board might get you upwards of $500 for certain Roller Derby boards, most are going to go in the $10 to $50 range.
Hope this helps.
Mark
i just had one appraied it it the model called the rocet its red and has decal of a rocket with box valued at $ 250.00
Roller Derby did not start making skateboards until late 1963, early 1964. Their first skateboard was the #10. How did you date your Deluxe?
don't know
Greensboro Roller Derby was created in 2010.
Roller Derby - brand - was created in 1936.
Roller Derby Germany was created in 2011.
Helsinki Roller Derby was created in 2009.
Houston Roller Derby was created in 2005.
Pacific Roller Derby was created in 2008.
Junior roller derby was created in 2007.
Roller Derby Toulouse was created in 2010.
Wasatch Roller Derby was created in 2008.
NEO Roller Derby was created in 2007.
Toronto Roller Derby was created in 2006.
Maine Roller Derby was created in 2006.