You'd probably be best off looking on Amazon/Ebay. I got some iPod headphones that probably aren't real for very cheap off Amazon UK. They're still working today, and they're good quality.
Australian Open 2008
French Open 2012, 2014
US Open 2006
Victoria Azarenka | Petra Kvitova | Angelique Kerber | Caroline Wozniacki | Serena Williams | Heather Watson | Eugenie Bouchard