Ooh wands! Do I need to buy one? Or should I leave?

You take a look at the price list...

Wands (4 Galleons): Length (7 - 14 inches) Core (dragon heartstring, unicorn tail hair, unicorn mane hair, phoenix tail feather) Wood (ash, cherry, holly, pine, birch, maple, rosewood, oak)

Bottle of Polish (10 Sickles)