The pretty Tiffany blue color was originally introduced by Chanel this Fall. It retails for $23 but sold out immediately and is hard to come by.
Then, Essie introduced Mint Candy Apple as part of their Holiday 2009 collection. It's much more affordable at $8 a bottle but I thought I could find something even cheaper.
So, I headed to Sally's Beauty Supply and found a color called For Audrey. It appears to be an exact match and only set me back $4. I put it on my nails immediately and LOVE it. It's fun, playful and festive. China Glaze is a great quality polish, so there is no worry on chipping or streaking even though it's less expensive.
Seriously, try it. The China Glaze pic looks a bit more blue in the picture than it is in real life. It's much more similar to the color of the Essie nail polish. You'll be amazed at how pretty it looks!