There are 5 chips
Red, Green, Blue, Tan and Lavender.

According to Black's 2004 Guide

Green TRO-0 $60-75
Tan TRO-0a $85-100
Lavender TRO-0b $85-100
Blue TRO-0c $100-125
Red TRO-0d $100-125

I believe however the value on the red [TRO-0d] has dropped by about half as more chips seem to have entered the market