Looks like the others have referred you to some great informational sites on the subject. However, if you're just looking for information on foreclosed properties that are currently available for sale in DC, working with a Realtor is really your best bet - and I'm not just saying that b/c I'm biased ;-)
The bottom line is, Realtors have direct access to the MLS database that contains all current listings - foreclosures or otherwise - as well as all details related to those listings. Unfortunately, consumer websites like this one can't provide the same level of detail that your Realtor can.
As for "purchasing options," it sounds like you might be interested in learning more about different financing options for your purchase? If that's the case, I'd be happy to refer you to some great lenders who could discuss those options with you in detail.
Feel free to reach out to me at any time if you're interested in any of the information mentioned above, or if I can be of help in any other way. My contact information is all below. And either way, best of luck with your search!
Alia J. Khan
Realtor + Recovering Attorney
Real Living | At Home
Dining Editor | Bisnow Media