If you are looking for interest only loans then you need to find lenders that offer what is called an ARM loan (adjustable rate mortgage). There are several different types available, such as a 5/1 which tends to be the most common, 7/1, or a 10/1. Depending on which you choose you would be paying interest only for the first leg of it the 5, 7, or 10 years at a fixed rate. Then there after your rate is subject to the martket, making it variable. They do have caps on the rate, so your payment doesnt quadruple in the next month but these caps are annual so they will continue adjust. Understand that if you go that route, although your payment is lower, you will have not paid down any of the principle balance. So while it may seem lucrative to jump in, you should try to have a better understanding of the loan so that you don't get in a position where you have been paying interest payments for 10 years and still owe the full purchase price. Try to have an exit strategy so you can see if this type of loan will work for you.
Good luck :)