A more affordable version of...

Vera Mona's Color Switch.  After watching the video on how the product works, I was impressed!  Doing a look with several shades varying in light and darkness can require many brushes and there aren't many products out there that can remove the color from the brush you are using to make it usable right then and there.  But not everyone can afford the $16.99-19.99+ price tag and I found a few videos that showed other options.  While they are not the same size or have the same case as the Color Switch, this might be a good alternative for different budgets.

Dorota MUA - Vera Mona Solo vs DIY eyeshadow switch + tutorial.
gossmakeupartist - How to instantly clean your make up brushes without washing/spray or alcohol!

I would prefer the Color Switch as opposed to a plain stippling sponge for the case and larger shape.  Which would you choose?