This deal has ended.
Buy.com has the Logitech S510 Cordless Desktop Keyboard and Mouse Combo for only $29.89 after a $20 mail-in rebate valid through 11/26. If you spend $50 pre-rebate (here is a $5 pack of HP paper) and pay via Google Checkout you'll get an additional $20 off, cutting the price to an effective $9.87. This is over $60 most places and is $48 at Amazon. Shipping is free and there is no sales tax (except CA, MA, MD, TN).