You can buy this ring HERE from Mr. Kate for $58

Similar ones you can buy, From Tilly's:
Full Tilt Fushia Moustache Ring HERE for $7.50
Full Tilt 3 piece mini rings HERE for $8.70
Full Tilt Mustache 2 Finger Ring HERE for $5.00

Or from eBay you can buy 2 for $1.00 HERE