Mascara isn't something I usually keep hanging around for long. I have a few favorites that I use all the time and then a handful of samplers.
I really enjoy testing out sample tubes of high end mascaras. I've tried Diorshow, Tarte, Urban Decay, Clinique, Estee Lauder, MAC, Benefit and others. However, I still prefer L'Oreal Voluminous and Cover Girl LashBlast.
These are excellent quality mascaras for a nice low price. Plus I'll usually wait for a good sale and buy a few at a time.