Where do I find crystal or rhinestone pins for the chair sashes?

Saw a My Fair Wedding show and was wondering where I could get the crystal pins or brooches that were used for the chair sashes, I would need 300.
They are at least 3 inches and they were just round. Either they were rhinestone or crystal, I’m not sure if they were a pin or a brooch sort of thing or even a slide.

Oriental Trading sells pins and brooches in bulk, all sorts:
www.orientaltrading.com

Good luck!

Brooch Pin Crystal
Brooch Pin Crystal
Brooch Pin Crystal