Three other points:
First, Short sales can take a long time to transact. A "normal" sale might take 45-60 days. A short sale can take 4-6 months or more. I've know plenty that have taken 8, 10, 12, or more months. That's due to the lender taking a long time to decide whether to permit the short sale.
Second, because the transaction is contingent upon lender approval, a lot of short sales don't go through at all. The lender says "no."
Third, unless you've identified a specific home you want to make an offer on, don't limit your search to short sales. They're not all as difficult as I've suggested above, though many are. More to the point, though, you'll be limiting your options if you look only at short sales. If you're looking for bargains, moreover, some short sales are, but many aren't. Same with foreclosures. Just because a home that sold for $500,000 a few years ago is now listed for $350,000 doesn't make it any bargain. The question is: What's the home worth now? Not: How much of a price reduction from the last sale am I getting?
Hope that helps.