How do I source it?

Glycerol can be purchased in Australia from supermarkets, pharmacies, and chemists under the name of glycerine. The cost is less than $AUD10 for 200 ml.

It should be noted that the description on the bottle can cause confusion, as it is listed for use as an emollient to soften roughened skin. Glycerol is safe to ingest according to the recommendations provided herein.