There are a few ways to get foreclosure data, they involve a bit of homework, and no one is really - or likely to just tell the whole world their method. You need access to city/county records, you have to look at filings, then go see the property, find the owner, yadda, yadda...the papers ahve several "public notice" sections to read through, and the gov't has properties, HUD homes, that can be found publicly, but most sites require a fee. There is so much background work that needs to be done, the fee is sort of nominal for what you will get. Lis Pendens is really where the work begins, once something is in foreclosure, the competition is generally fierce.
NYC has ACRIS, the finance database, but it is not easy to navigate and identifying documents etc can be cumbersome, many sites offer free tirals with full access, I would try one out. Wish I could help more, perhaps someone else can offer insight.