ITIN loans are available and I have dealt with a couple of them. The old Banco operation closed up as well as most other ITIN lender but there is one I know who works. The rates are not pretty. But, when the borrower has no choice....
Ask me and I'll put you in touch with a lender who has been doing them for years.
Seller-financed homes are in NTREIS (such as they are). If you need help pulling them, contact me.
BEST IDEA....rent for 2-3 years way way below what you can afford to pay. Find the cheapest house or apt you can stand to live in. Bank the extra money, and use it as a down payment when you have a big pile of cash.