| Stop by an electronics store. They are sure to have knobs for pots, far cheaper than a guitar store, and in more styles.
I got some sweet heavy-duty brushed aluminium knobs for my bass, which wont break off like my old plastic ones.
On that note, if you need replacement pots, they are alot cheaper from an electronics store too. Like a buck or two.
Music shops charge about $15 for a pot, and it's not like the quality justifies it. | 
