I recently discovered (a few months ago) Sinful Colors nail polish at Walgreens. They have a beautiful line of colors with cute names, and it's $1.99 per bottle. My only problem with it is that it's a bit sheer, so you need a few coats if you like it dark.
I don't live in a big town, so I have no access to OPI, Essie (although I have a gift set that I received for Christmas), or China Glaze, but I heard they were very good brands and worth the money.
Here's a picture of part of my nail collection from sometime last month (It has expanded since then)
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Thanks for reading :D I'll be (attempting) giving up nail painting for Lent, so this blog will be taking a short hiatus~