I'm not sure of brands per se, but if you need to stay on the cheap, I've found that neon green poster board works just fine. I get rolls of the stuff from my local craft store. Obviously, that would be the disposable option, but, whatever works.
Gumby Imagined, The Story of Art Clokey and His Creations
The ultimate Gumby retrospective packed with incredible photos and never-before-shared stories. Written by Art Clokey's children, Joan and Joe Clokey, this is the most comprehensive book ever published on Gumby, Davey and Goliath and their creator Art Clokey, a pioneer in stop-motion animation.