B&H has the Vello Shutterboss Version II timer remote for Canon and Nikon cameras for $39.95 (reg. $49.95). This is a cheaper alternative to the pricey Canon model that works very well (read my review) for the price. Check it out here at B&H Photo.
Vello ShutterBoss remotes for most Canon, Nikon and Pentax DSLRs are available for $34.50 right now (normally $52.50). These remotes serve as interval timers and remote shutter releases, which are essential for timelapse recording on Canon DSLRs. As a result, these are a cheaper alternative to Canon’s own $130 TC-80N3 remote.