Buy big test tubes in bulk, 1x8" (25x200mm), only $1.60 each or save 60% in bulk lots. Unmarked glass test tubes can be used for product displays of candies, flowers, powders & bath salts. Heat resistant borosilicate glass ("Pyrex" TM) makes them food and dishwasher safe. Tube capacity/volume is ~100 ml/4 fl. oz.
Stoppers not included; get the tube/stopper combos & save 50%.