Who doesn't want their dime to stretch? Here's a quick way to keep your foundation bottle fuller for longer. Let me first preface keeping the bottle fuller by the form of application. This will only work if you apply foundation with a makeup sponge.
Take your makeup sponge and work in a pea-size dab of aloe vera or your moisturizer to the application part of the sponge. I've also heard this being done with simply adding water to the sponge, but I prefer something that will hydrate your skin instead. That way, it's a Win-Win!
Once you've worked in the pea size of your choice, go ahead and apply your foundation as usual. I guarantee you'll have a few more applications per bottle once you start doing this. The point is that part of the sponge that would usually soak up some of your foundation will already be full of a moisturizing substance. Keeps the foundation on the outer part of the sponge and more will get onto your skin.
Let me know how it works out for you, or if you have a different alternative to aloe or moisturizer.