dealsmicrosoft lifechat lx-3000 headset for $11.50

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Add $7.25 for shipping = $18.75

but...

Newegg has them for $23.99 - $5 (use promo code EMCNJHF62, expires 1/30) = $19
with free Shipping.

I would go with Newegg...better support and well-known:

http://www.newegg.com/Product/Product.aspx?Item=N82E16826105209