Anyone know where I can find apartment in Boston?

Anyone that lives in Boston knows how hard it is to find an affordable home!
Everywhere you look it's shared apartment or one bedroom to rent for $900 sometimes even more!
Anyone know where I can find a place for my spouse and I and our baby girl coming in August? Privite and affordable?
Down further in Massachusetts would be more affordable but work and church and our whole life is here close to Boston and we wouldn't move too too far.
Husband makes about 4,000 in a month and yes it sounds HUGE but Trust me, if you live here Boston, you'd know how difficult it is to find a home. 
Any websites or apartments?
No mean comments please.....
This stresses me out sometimes to the point of tears... it's not easy not feeling like you can give your baby the best life they deserve..