Store bought ones are expensive when you have more than 10 plants in the garden besides I love the challenge of looking at something about to be thrown away or just taking up space in the closet and coming up with something to make with it. My daughter and hubby take their music CD's out of the plastic cases they come in and store the CD in a carrier. So we end up with bunches of cases that they don't want. Take apart the cases, remove CD holder insert. Now you have two plant marker wannabes. Use good old Sharpie markers to write and draw on one half of each one (the lower half goes into the ground). I used the really broad tip Sharpies and painted the background color on the backside, then used the medium size tipped ones to write and draw on the other side. The Sharpie will not come off in water, I have tried using my fingernail to scrape it and it has no affect. That is good for actually using them in the yard, but also means that mistakes are there for eternity.