I’ve been combing the web for science deals. If you want a set of test tubes with a rack, I recommend buying a set. HST explains the different test tube sizes, their volumes, and stopper sizes. Buy a set instead. Be sure the test tubes are Pyrex or borosilicate. I haven’t found tremendous deals. The set below from HST includes a test tube brush and test tube holder. BTW, a plastic test tube rack might warp a bit with a hot test tube; most of the time there is little or no damage. If you buy eScience kits used, often there is a cardboard test tube rack included in the kit. They work fine for most labs, too.
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