Actually, Mark, that phrase, abbreviated in that way, pre-dates The Moon Is a Harsh Mistress by at least 30 years. Also TINSTAAFL, "There IS no such..." You can look it up on Wikipedia. Heinlein was a good writer, though. He would have grown up in an era where that was used commonly.
Sadly, my collection of his work was in a particle-board bookshelf downstairs when Katrina flooded my house and kept everything soaking wet for 3 weeks. The party-board dissolved and my books - including over 1000 titles of loose sheet music, several collections, and at least two dozen hard-to-replace "fake" books - got soaked to the point of being useless. Some of the books were SO far out of print as to be totally irreplaceable, and one of my favorites was one my uncle gave to me when I was still learning keyboards. Definitely a bummer.
If I had known we would get that level of flooding, I would have moved the collections upstairs, but I had limited time to take action. We were going to Texas and had a ton of preparations to complete.
I also lost the Foundation double-trilogy, some good Arthur C Clarke, and some Poul Anderson. Plus a collection I had been accumulating from The Science-Fiction Book Club, which would ship a hardcover anthology or a small selection of single books once a month. I must have lost 50-75 really good titles.
Sorry, thinking about Heinlein caused me to digress a bit.