Dropper bottles with graduated droppers, where do Ceretropic get them?

Volumetric dosing is an extremely effective way to accurately measure out doses. While it can easily be done with a HDPE bottle and a 1ml syringe it is easier to do with the type of bottles Ceretropic uses since they have graduated droppers (at least some do, I have such a bottle that their Caffeine/NALT solution came in for example).

I have tried to source such bottles myself but since I guess empty dropper bottles (esp. with graduated droppers) are a B2B product they were difficult to find on eBay/Amazon/AliExpress at reasonable prices. Since I believe 0.1ml ticks are a must that further complicates things (I've found ones with 0.25ml ticks).

So my question is:

Where do they get them and how could I get them?

Alternatively:

How do you store and measure out your solutions in a smart way?

---

Bonus karma: I would also prefer clear glass bottles rather than blue-tinted (easier to see solute stays in solution, color of solution, etc.), but that's not as important.