Don't know whereabouts you are, but look for a good second hand DSLR. On various forums I am on Canon 20D bodies are now down to $200-$300, and you may be able to pick up a general purpose lens like a Canon 18-55 fairly cheap. These will be fine for starting out and getting to know DSLRs and down the track a bit you can get better lenses and then upgrade the body to something later with more features.
Camera stores sometimes have used goods that have been traded as well. but they tend to be more expensive
Forums with good numbers of members and thus many items for sale (or you can out a wanted ad)
Canon POTN (US based worldwide):
http://photography-on-the.net/forum/Australian Photography:
http://www.ausphotography.net.au/Texas Photo Forum:
http://www.texasphotoforum.com/forum/portal.phpHere is a link to a 30D on POTN for just $400 (US though). That;s the sort of price you can expect to pay.
http://photography-on-the.net/forum/showthread.php?t=885356