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Newegg.com has the Sennheiser CX 300 Series In-ear Monitor Earphones for $9.99 after $15 rebate [exp. 10/31/08] with free shipping.
Final Price for this deal: $24.99 - $15 = $9.99 + Free Shipping

Description:
The CX 300 black are high-quality stereo ear-canal headphones with powerful, bass-driven stereo sound for listening 'on the move'. Ear adapters in three different sizes ensure a perfect fit, high wearing comfort and an excellent attenuation of ambient noise. The CX 300 are ideal for use with MP3, CD, MD, or DVD players and many other portable devices.