Make sure you buy a timer that is rated higher (AMP wise) then what you're using it for. I use the electronic timer b/c it's more reliable. I paid about $10 for mine from Wal-Mart, but it might have been b/c of a clearance. I think the electronic timer are about $20 from HOme Depot.

The timer that use pin(s) to trip it on and off sometime get stuck in one setting.