I can't find anywhere to get quarried stone to build my house on the hearthfire expansion so I would like to know lots of places to get it.
Near any house plot in Skyrim Hearthfire there is a quarry in the direct vicinity of the house plot.
As example, for the house plot in Falkreath, the quarry is directly next to the construction bench. You just need a pickaxe to quarry it. Fortunately there is a pickaxe right next to it.
There are some other places too in the world, but I don't think it would make much sense listing them because of what I said above.
Quarries also provide an infinite amount of "Quarried Stone", so you don't have to go anywhere else.
There should be a quarry right near your plot, with a pickaxe laying right next to it.
It will never run out of stone so you have an unlimited amount and you'll get 4 stones every 3 seconds!
As a bonus, here is a map link : http://srmap.uesp.net/?centeron=Gray+Pine+Goods
The steward of your home can supply you with Quarried Stone and other building materials. They will sell 20 units of Quarried Stone for 100 gold.