If you don't mind me asking, why do you want a lease purchase? It is more adventagous to do a straight purchase. With a $2200/month rental payment you could be paying for your own $300,000 home in Philadelphia or a home in the Suburbs for slightly less (due to higher property taxes). All you would need to put down is 3.5% with an FHA loan which you could receive as a gift if you did not personally have it. In the areas of that you asked about we definetly have homes on the market that would fall in or below this price range.
I would be happy to help you with your home search.
$8000 First Time Home Buyer's Tax Credit Will Expired on April 30th 2010
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Second, to find lease-options, read my blog at http://www.trulia.com/blog/don_tepper/2010/03/how_you_can_fi That'll tell you (and your Realtor if you use one) how to find lease-options.
Hope that helps.