I've gotten six or so since I started playing about 1.5 years ago. In fact I got one last week. I'm sure it's just a coincidence but every time it's been when I was on a very low level toon. When gathering on my max level toons, which I do most of the time for obvious reasons, I've not gotten one. Odd that.
The purpose of art is washing the dust of daily life off our souls. ~Pablo Picasso
I've gotten 3, no idea when or where. Sometimes I just find one in my crafting bag when I go to craft.
Never found a cypher though, had to buy that one just so I could have the recipe on my max provisioner.