I checked Amazon and the ones I liked were about $5 each. I also wasn't happy about bringing extra plastic crap into our home. So I thought about how to make one.
Lego construction seemed a promising route.
This should work equally well for other tubed materials like sunscreen, makeup, oil or watercolor paints, etc.
Step 1: Pieces
-2 bars with holes, at least 9 holes long for a standard tube. Longer is fine.
-The critical pins that my son the Master Builder calls "threes." These pins have one end that fits securely into a bar's holes. The other end has a double-long section that the bar can slide on. This lets you adjust the distance between the bars.