Plans, material list, and cut list to build a 16 tube, 2 row, rod rack from PVC for under $50. Light weight!.
A mitre box saw would make this an easy 2-3 hours Saturday morning project. No screws used to build the basic rack.
Want to get even more fancy. Sit the completed rack on a piece of 1/2 plywood. Trace around the base of the rod rack. Use just 4 screws to screw it to then bottom of the rack, and then add 4 swiveling caster wheels to make it portable.