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Logitech MK850 Performance Wireless Keyboard & Mouse $29.95 + Free Shipping
Update: Sold Out
The MK850 supports the pairing of multiple computers (via more unifying receivers or perhaps other methods) so it can be significantly more valuable in that sense. I just don't like the actual keyboard or mouse, but at least the mouse has thumb buttons.
Oh wait, I forgot the m720 has the middle button that switches from smooth scrolling to slick scrolling. Yeah it's definitely worth the extra $15 in this case.
Not always the best prices, but they had fantastic customer service back then. Dunno if that's still true today. I think the last time I ordered something from them was 7 years ago. They also sell as Mac Connection, which is probably better known among Mac users than PC Connection is among PC users.
I don't see any bankruptcies in their history on Wiki, although anyone could edit it to remove that info. So presumably they're the same company. Not another company which bought the rights to the name of a bankrupt company, like Gateway.