Some portfolio lenders will lend without PMI, even on loans less than 80% LTV.
Typically you can't get 30 year fixed mortgage from these programs, they'll only do ARMs and balloon loans. The banks that do these tend to be smaller, local banks, and will only do it with properties in their region. You can try searching for portfolio lenders locally, or just call a few of the smaller regional banks, and see if any have portfolio lending.