Carrie UnderwoodCarrie Underwood flipped the switch to help turn the Grand Ole Opry pink earlier this month, kicking off breast cancer awareness month. Now, she's doing even more to help the cause.

A special Daisy Rock guitar autographed by Carrie is now available at the Women Rock for the Cure online auction that launched yesterday on eBay. Also up for grabs is a one-of-a-kind PRS guitar signed by several artists who performed at this year's Opry Goes Pink concert, as well as guitars signed by Jason Aldean, Montgomery Gentry and several other stars.

Posters and other signed memorabilia are available on the site as well, with new items from Keith Urban, Little Big Town and other artists to be added continually throughout the month, according to CMIL.

All proceeds from the auction will benefit Women Rock for the Cure and the Greater Nashville Susan G. Komen for the Cure.