Your best bet is to look for properties (not bank owned) and try to find the ones that match your criteria that have been sitting on the market forever... go see them and MAKE YOUR OFFER!
Your offer to purchase is obviously going to be contingent on renting the property for 1 year or 2 year term, a good agent will fashion the offer in such a way that appeals to the owner (IE: a portion of your rent each month will go towards down payment and is non-refundable if you fail to preform, etc.) The list agent is not going to like this idea but they MUST present the offer!
This is done with 2 things #1 a lease agreement #2 a purchase and sale agreement (each is attached and contingent on the other).
You will have to understand your probably going to have to agree to a price that is attractive to the seller with terms that are attractive to the seller.
hope that helps you on a path to finding what you need...
Sincerely, Doug Crane (Jack Conway Realtors)