I use the Monster branded tubes. They aren't the cheapest, but they aren't actually round, so they don't roll away, and can be stacked up reasonably well in a drawer.
Found at a FLGS. Any game store that would sell playmats probably also sells tubes. This one is nice because it's actually shaped like a rounded triangle, so it doesn't roll.
Here it is on Amazon: https://smile.amazon.com/Playmat-Tube-Monster-Protectors-Prism-shaped/dp/B008NEOE48
I use the monster playmat
tubes https://www.amazon.ca/Playmat-Tube-Monster-Protectors-Prism-shaped/dp/B008NEOE48
I have upwards of 24 playmats. I store them all upright in:
https://www.inkedgaming.com/products/custom-gaming-tote?variant=28698889485
As for life expectancy….my oldest may is about 5 years old…and not showing any real sign of age. Keep them clean and protected, they’ll last a long time.
I use playmat tubes to store my extra mouse pads
https://www.amazon.com/Playmat-Tube-Monster-Protectors-Prism-shaped/dp/B008NEOE48?ref_=fsclp_pl_dp_1
I really like Monster playmat protectors. They're cheap, durable, and don't easily roll off tables.
Monster protector tubes are great for playmats, but I can't find tubes to hold playmats longer than 14".