@Sophiai can find paints everywhere but they are small ao having a look online sounds like a good idea. Im sure there will be something there. Sometimes shops have online only offers ao will take a look around. Yep theres another art thread called 'Through ones eyes' as well.

I think bunnings has these but you buy drop sheets and you can stick them on the floor and put your table etc on the top so it catches all the spills. best to still do it outside though. If its really messy like splatter paint type stuff the dropsheets can be put up around the walls too.

https://www.bunnings.com.au/our-range/paint-decorating/paint-accessories/protection/drop-sheets

Any particular sort of art you'd like to do?