I bought a bunch for the rack system I built for the school at Lowe's. They shipped in a red tube with plastic caps. I bought all they had left of 1/8" steel, so they let me keep the tube also.
I haven't found any 1/8" stainless rods around here so I went with regular old cheap cold rolled steel. After our school launch, I always give them a wipe with a greased rag so that they won't rust while stored in the tube. I tried an oily rag one year, but the oil didn't stay on the rods well enough to keep them from rusting. When the school launch comes around, I wipe the grease off with a quick swipe of a clean rag and they are ready to go. It's a lot better than scrubbing the rust off with sandpaper, steel wool, or scotchbrite pads. The rack is only used once per year, so what I do may be overkill for most folks.