Zoya nail polish is having its annual Earth Day deal from April 20-27 (ends 11:59pm EST).

• Choose polishes at http://zoya.com (minimum order 6) and add them to your cart.
  
• At checkout, use the code EARTHZOYA before submitting order. Shipping will be free and polish will be $4 per bottle (so, minimum $24).

Theoretically this is an exchange. If you want, you can send Zoya your old, expired, gross nail polish, and they'll dispose of it appropriately. BUT you don't have to send them anything; they'll ship your order anyway. If you have nail polish that's still good (just not your color), see if a local women's shelter would like it -- they usually do.

Full details here. [blogspot.com]

Notes: Zoya's customer service is uncooperative, so make sure your order is correct -- they won't change anything after the fact. And if you don't receive a confirmation, your order "didn't go through" even if the site said it did. But the polish is really gorgeous, quality stuff...and at $4/bottle, it's higher-end stuff for less than many drugstore brands. If you want to see pictures of what a color actually looks like on someone, google "zoya [polish name] swatches" and you'll generally find a lot of results.