The martial arts catalog I used to get annually from my instructor had some nice ones that weren't too pricey (got my first set from them). It was Century Martial Arts but I can't be sure that they still stock throwing knives. I'll check some affiliated companies for you.
Or this place: http://http://www.knife-depot.com/throwing-knives/
The silver ones are similar to mine. They're mainly competition grade, though.