If you can wait until the end of the year, you will be able to get people to knock prices way down. The housing bubble that has been building for the last few years just burst, and over the next couple months, year, whatever, people are going to be finding out they nobody wants to buy now. This means that sellers will be getting rather desperate to unload.
As for your price range, I doubt you will find anything in Worthington, German Village or Grandview. I know for a fact that it's easy to find houses for $100k and below in Westerville, most of the houses in that area in that price range were built around the 1950's so keep in mind you may want to update the electrical system if you buy there. I don't know so much about the other areas you listed.
For websites, try out Craigslist and realtor.com. Just make sure you keep Mapquest around to check the location, I've found its easy to find a house that looks like a great deal, but ends up being in a shit location.