Microsoft Strategic Commander free after mail-in rebate (although no one seems to have it in stock--it'll be back ordered).

Buy.com has it for $20.95 + S&H at http://www.us.buy.com/retail/product.asp?sku=10255632.

The $30 rebate is at http://www.cusarebates.com/coupons/0209590.pdf.

(courtesy of SlickDeals)