Hobby Lobby has 1.5 & 5 lb packs of silica gel. The local one in Covington stocks it but seems to be out of it alot. You can also get those sache net bags they use for potpuorri to put it in. If you want less expensive, just go to Sam's and get a big bag of cheap rice and use that instead.
Rice works surprisingly well. Just remember to replace it once in a while just like silica gel. One advantage to rice is you can spread it out on a cookie sheet in a real low oven and dry it out to reuse. But why, it's just rice!
I dropped my phone in the drink once and put it in a big mason jar full of rice for a couple of days. Worked.