to cost an arm and a leg
to be very expensive
tighten your belt
to spend less money than you did before because you have less money
save for a rainy day
to save money for a time when it might be needed unexpectedly
make ends meet
to have just enough money to pay for the things that you need
to make a killing
to earn a lot of money in a short time and with little effort
dirt cheap
very cheap
live from hand to mouth
to have just enough money to live on and nothing extra
look like a million dollars
to look or feel extremely good, often because you are wearing something that costs a lot of money
rags-to-riches
used to describe what happens to a person who was poor but becomes rich
bring home the bacon
to earn money to live on