I have a Hahnel Giga T Pro system, which I'm very happy with. It is wireless - operating on a 2.4 GHz system, and cost me just less than AUD $100 - but I really needed a wireless system for what I do, including:
1) regular wireless shooting at more than an arm's length distance,
2) also time lapses - controlled & programmed from indoors,
3) quick speed and programmable sequences of shots.http://www.hahnel.ie/index.cfm?page=dslrremotecontrols&id=80&pId=80
You and/or other people might find wired systems work for your needs... and that's great - probably saves both in terms of money (and batteries). I have only gone through 2 batteries (the transmitter and receiver each have a battery, different types, but each type readily available from most department stores).
It can also operate as a wired system using just the transmitter which uses the same 'wire' as the receiver and so can plug directly into the camera. (The version I have for Canon works on most Canon DSLRs, it has 2 wire connections, so it fits both my 7D and 350D).
My transmitter / receiver seems to work fine to a distance of about 30 metres, or about 10m to 15m through walls.