I lay out my paints on a strip of safety glass that has been cut into four equal sections. This sits atop my glass palette in the spot where my paint used to go. At the end of a painting session, I place all four sections of glass in a Tupperware container that goes into the freezer. The paints stay wet for a good week. Sometimes I have to scrape a little film off the viridian and the umber. Other than that, I waste very little paint.
As a side bonus, when I clean my palette during a painting session, the paints are located on the glass strip and out of the way of my alcohol rag. I just wipe up to the edge of this strip and my whole palette is clean.
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