Unfortunately the opportunity for foreclosures window has pretty much closed. I would not recommend the pay sites only because nothing is guaranteed. When I first started, I paid 20 bucks a month for a site that gave me nothing! When I first started about 3 years ago, I was just lucky to fall into some of the BPO companies and a few banks that use me as an REO listing agent. Most of the companies have all the agents needed to do BPO's and foreclosures. If you’re looking to do bpos you can try http://www.clearcapital.com.
Short sales are where your opportunity is! I will give you two sites. http://www.titaniumsolutions and http://www.CDRSCertified.com You can join Titanium for around $200. They have online training and certification to do short sales right away. Once you complete the course, you can start taking leads. This has paid off more me very well! I also signed up with CDRS which is another short sale certification. This one costs about $500. You take a 3 day, 3 hour class for a total of 9 hours online. I would make the investment in both of these companies! Short sales are running the market right now. Get yourself certified and in the door with the right training needed to facilitate a short sale. There are too many agents running around out there that have no clue what they are doing! I hope this helps.