Just want a bottle, up to 1L, I am banging my head against a brick wall.

Anyone know?

depending on your end-use, what about Prep-Sol as an alternative?

or, try a Paint Shop

the stuff the girlies use these days is a synthetic weaker acetone lookalike, and only in small small bottles

Got to a boat repair place that uses fiberglass... they will have acetone.

If you have a chemical supply store in your area they will have it.

Tywais is correct. I beat my head for a while looking for acetone and then went to a local chemical supply shop here in Ban Chang and the owner asked me how many liters I needed? I bought a container he filled with about 1 gallon. I don't recall the exact cost but not cheap. Before this source I used nail polish remover as a substitute but I believe this has some other additives not pure acetone.

The HomePro type stores just scratch their heads when you show them a photo and the word Acetone and try to sell you thinner.

Yep, these Thai hardware stores are <deleted> useless. Yep, all want to sell me thinner.