Sun box. It's a big boxy lamp with very bright lights that you sit in front of for 10-15 minutes in the morning to treat seasonal depression. Unfortunately the price range is about the same as the sunrise clocks, i think, but you can check.

Morning light (and food) were key inputs to the biological clock last i checked, so the ideas of the sunrise alarm clock or sun box both tackle the darkness you're probably dealing with. If you can't afford them you may be able to do something with the concept of getting bright morning light. I know some people take a normal really bright lamp and put it on a timer as a poor man's sunrise clock. Of course when/if the sun is up you can go outside and get the real deal.