Money in the form of cash that is readily available(noun)
WordNet. Princeton University. 2010.
Use "ready cash" in a sentence
"In passing, it is well to say that this picture of Vernet's is the parent of all the panorama pictures that have added to the ready cash of certain enterprising citizens of Chicago, and that Vernet is the father of the modern “military school.”"
"My master was greatly vexed, that is, I may say, as much as ever I seen him, when he found how he had been taken in; but it was some comfort to have the ready cash for immediate consumption in the house any way."