http://cgi.ebay.com/Traxxas-REVO-Spe...item5642c1df1d
Traxxas Spring set not bad for the price since you get 2 of each color and spring rate can adjust from there.
http://cgi.ebay.com/RDLogics-Color-S...item1e622bc31c
another set and this add shows the spring rates for each color of the sets.