If it's a clicker you want, I've seen the Shakespeare 1094 pop up online for ten bucks several times. I have three of them. If you never fight a fish on the reel, then they're alright for the price.
I found one for ten bucks, but shipping puts it at $16.50.
Shakespeare Fly Fishing Reel
If you want something even cheaper, check Google for crappie reels. Some of them are really just fly reels. And if you're into the super cheap, there is a composite (plastic) reel that I often find for five bucks, sometimes even less.