Reddit reviews Ajax Scientific Kiln Dried Wood Test Tube Rack with 6 Drying Pins, 6 Tube Capacity, 240mm Length x 70mm Width x 90mm Height
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Ajax Scientific test tube rackMade of kiln dried woodIt has 6 openings of 24-millimeters diameter and 6 drying pinsMeasures 240-millimeters length by 70-millimeters width by 90-millimeters height
You might be able to find a stand like made for regular pens, vape pens or crafting supplies. I've seen wood ones on Amazon and clear plastic ones at Dollarama.
Maybe this will do the job, might be too tall though. https://www.amazon.ca/Ajax-Scientific-Drying-Capacity-Length/dp/B00EPQ4SL2/ref=sr_1_10?
or this
https://www.amazon.ca/Acrylic-Strong-Organizer-Laboratory-Exhibition/dp/B0721MCRRZ/ref=sr_1_9?keywords=test+tube+holder&qid=1555072355&s=gateway&sr=8-9keywords=test+tube+holder&qid=1555072251&s=gateway&sr=8-10
This single pen stand might be what you want too.
https://www.amazon.ca/Coideal-Container-Toothbrush-cigarette-Organizer/dp/B01KM540R6/ref=sr_1_5?keywords=pen+stand&qid=1555072442&s=gateway&sr=8-5