Thankfully, Buy.com has you covered as they have notified us of an upcoming sale. Starting Sunday, January 18th (at Midnight PST), they will have it available for a low $69.99 (30% off). Of course their are cheaper alternatives to hook up wirelessly, but this thing seamlessly plugs/snaps into the back (and is very tempting at this price).
Source: Gamerdeals.net .
UPDATE: Xbox 360 red controller + play and charge is supposed to be $43.
Edited by CheapyD, 18 January 2009 - 01:24 PM.