Though I've been a little late to jump on the mushroom/taupe nail color band wagon I happened to stumble upon a fantastic, much cheaper version of the Chanel Particuliere #505 Nail Le Vernis. I'm loving the taupe neutral shade on my nails this season and Essence's Walk of Fame is the perfect look-a-like to Chanel's $30 nail color. Essence is not only extremely reasonable it's actually pretty high quality, lasting for quite awhile without chipping (if two coats were applied, with/or without a clear top coat).
Chanel Particuliere #505 Nail Le Vernis, Amazon $29.89
Essence Colour and Go Nail Color, Ulta $0.99