Plastic Test Tube Rack Set 2 Sizes to fit Both 12/13mm and 15/18mm Test Tubes 50 Hole Clear Karter Scientific 208U5 (Pack of 2) : Amazon.ca: Industrial & Scientific
BIPEE Plastic Test Tube Rack for 25mm Tubes, 24 Well, White,Detachable (24 Hole) : Amazon.ca: Industrial & Scientific
Fisherbrand™ Three-Tier Polypropylene Test Tube Racks | Fisher Scientific
Karter Scientific 208V2 Plastic Test Tube Rack for 12/13mm Tubes, Holds 50, Detachable : Amazon.ca: Industrial & Scientific
Test Tube Rack, Centrifuge Tube Holder (2 Pack - Blue and Orange) for 10ml, 15ml, 50ml, Detachable Plastic Stand, 28 Well : Amazon.ca: Musical Instruments, Stage & Studio