Reddit reviews AGEOMET 60pcs 12 x 75mm Plastic Sample Test Tube 5ml with Lid, with 1 Test Tube Brush
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Amazon sells plastic ones with caps that you could order, but it looks like a lot of them come in packs of 50. Here's one that's a pack of 12 for $10. Your local big box store might also sell them? As long as it's plastic, has a rounded bottom and a cap it should be fine.