In the Pittsburgh area, all the foreclosed homes can be shown by any agent who is a member of the multi-list (which is pretty much every agent). You'll want to pick an agent who is familiar not just with foreclosures, but also other "distressed" properties which might also be selling well below market value, but aren't owned by a bank like foreclosures. Typically, the agents who do most of the listings of foreclosures don't work as buyer's agents. They will work with someone else who shows their listings and understands what it takes to make a successful REO (Real Estate Owned) offer and knows how to get the contract closed.
You definitely want to work with someone who is YOUR agent, that is, someone who has a fiduciary responsibility to you in the transaction.
I see you are in the 15243 zip code, I also live in 15243, and my office is right on Cochran Road. However when it comes to showing properties I've sold homes in most of Allegheny County. Last year I represented 12 clients as a Buyer's Agent in foreclosure deals. (Actually I represented a few more, but not all of them were the high bidder). If you'd like to get together and discuss the process, what it takes to make a successful bid on a foreclosure, and get some information on foreclosures in areas you are interested, I'd be happy to meet with you.
The best place to reach me is my cell, 412-334-5704.