Anyone know where to buy these rubber balls?

[Mr.Shrimps]

Not sure if this should be in the DIY forum category but I am looking for the little rubber balls that are shown on the end of these acrylic tubes. Anyone know where I can buy them?? :spin2:

 

[johnike]

https://www.thomassci.com/scientific-supplies/Rubber Bulb

 

[Rybren]

I don't care what the rest of the Loungers say aboot you John, I think that you're a ggod(ish) man!

 

[johnike]

You know me, ever so helpful.