If you find a mascara that really works well for you, save the brush. That's the part that's doing all the work to get the style you want on your lashes, not the actual mascara. All mascaras are the same, just divided by waterproof or regular, so you can dip your favourite wand into any mascara and you will still love your look. I learned this from my makeup artist sister. I use my expensive Too Faced brand wand on cheap drugstore mascaras, and I still love my lashes while I save $20 a pop!
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I found that if I add a tiny amount of oil to a dried container of mascara and then use the lash brush to "mix" the oil with the mascara, I am able to stretch the use of the product!