:) Someone wants to rent a house. So he likes one and chooses to rent it. And the person who is renting it out says:
Tenant: It costs just $200 per week.
Renter: Oh! It is out of/ dosen't fit my budget.
So the person shows him another house.
Tenant:It will cost just $120 per week.
Renter: Great! That fits/is in my budget.
So in situation 1,what sounds natural:out of/ dosen't fit.
And in situation 2,what sounds natural: fits/is in.