The best one I have found is made by a little company out of North Carolina called Super Nets. I think the URL is www.supernetsusa.com. I have used the "collapsible" JUGS screens and they are a royal pain in the posterior. They do not collapse nearly as easily as they would have you believe. And, since they are galvanized, you just about need a rubber mallet to disassemble it if you leave it sitting up for a few days.
The Supernets screen doesn not have the tethers inside the tubes like the JUGS. Instead it just snaps together. It is made out of aircraft aluminum so it is a lot easier to assemble/disassemble. It also fits into a bag that I bought at the Army-Navy store. It is slightly larger than the JUGS, but it will fit into the trunk of a Grand Prix or Grand Marquis. It may be $10 more expensive than the JUGS but it is well worth the money.