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Newegg.com has the BlackBerry HDW17906003 3.5mm Mono Headset for $8.99 with free shipping.

Product description from Newegg.com:

Model Brand BlackBerry Model HDW17906003 Spec Type Wired Headset Compatibility 9630, 9530 Storm, 9500 Thunder, 9000 Bold, 8900, Curve 8330, 8320, 8310, 8300, 8220 Kickstart, 8220 Flip 8130 Pearl, 8120, 8110 Features Features Have conversations on your mobile phone without switching headsets
BlackBerry Premium Headset is an in-the-ear miniature speaker combined with an in-line microphone for optimal voice pick-up

With the in-line answer/end button, you can activate voice dialing and answer/end calls with one touch and call mute button.

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