When something is obtainable, you can get your hands on it. Most information is easily obtainable or gettable on the internet these days. It's just a click away!
Obtainable comes from the Latin obtinere meaning to "hold, take hold of, acquire." When something is obtainable, you are able to take hold of it. On Black Friday, a good deal on a plasma TV is obtainable, you just have to be willing to wake up at the crack of dawn and stand in line to get it.