I have looked for and bought mine at Walmart for decades. They are pads that are often called QUAD-RULED when they have 1/4" squares on them. The last one I bought was a pad with dark green cover and a hard cardboard backing from AMPAD company. I think they are much cheaper than buying paper/ink and printing from home.
http://www.walmart.com/search/search...onstraint=3944
Jan in VA