Ya the buy/sell board has some good deals if your not in a hurry,and can wait for what you want.I see you want a Mandarin,very cool fish,reminds me of my older brothers who were hippies when I was a kid
You might want to think twice about keeping one though.Some people luck-out and find one that eats store bought food but most won't .They eat the infauna (bugs) in the sand bed and rocks and need a large tank because of this.You can set up a refugium with a smaller tank that will supply your main tank with bugs,but by the sounds of it this is more than your planning on.
until you become addicted
