Second, what's your urgency in finding a lease-option? Does it have to be a lease-option? If so, why? If you only have 2 weeks to find a place, then your first priority should be finding a place. And you'll find a lot more as straight rentals than as lease-options.
Having said that, if you know how to do it, finding a lease-option is easy. And while Anna is correct that most owners would rather sell than do a lease-option, many are finding themselves in situations in which they can't sell, but they can do a lease-option. I've posted many times here on how to find lease-options; just check some of my past posts. Several of the non-MLS techniques involve CraigsList--looking for properties that are listed as lease-options, looking for properties for rent, looking for properties for sale by owner, and other forms of prospecting.
Anna is also correct that there will be costs involved. You really should have a lawyer draft (or at least review) the lease-option documents. You'll also want to file a Memorandum Agreement with your local recorder of deeds office--that'll cost a bit. Then, it's likely the seller will want an up-front option fee. And there will be various other expenses.
Hope that helps.