Hi Renia- If you have a few towns you're interested in, I could provide you any Foreclosed homes for sale (listing data), which may be good deals and something to look at that many people do not look at. About half the properties in my database are not listed with are realtors.
Other than that, Trulia is good and free. And most realtors will allow you to do some preliminary searches of homes within your county that are listed on the state's MLS.
Good luck,

Ken L.

Hi Renia - I don't handle your area but you can search all Maine MLS listings on my web site, address below. Trulia is a useful tool for searching, too. If you are interested in viewing a listing, you will need to contact an agent who works in that area. Let me know if you need a few names.