What you get free costs too much.
Jean Anouilh (1910-1987) French playwright.
A thing is worth what it can do for you, not what you choose to pay for it.
John Ruskin (1819-1900) English art critic.
Why so large a cost, having so short a lease, does thou upon your fading mansion spend?
William Shakespeare (1564-1616) British poet and playwright.
The cost of a thing is the amount of what I will call life which is required to be exchanged for it, immediately or in the long run.
Henry David Thoreau (1817-1862) American naturalist, poet and philosopher.
The gods sell all things at a fair price.
Something you don't want is dear at any price.