The Phantom line of cameras from Vision Research is the main high-speed camera used in advertising, features, etc. Some of them go to 10,000 fps and more. Here are a bunch of sample clips:
Vision Research make high speed camera that are way less than $100K, think around $15K depending on the amount of memory and housing options. Renting a camera and operator is not that expensive either. We were looking at $2,500 per day for Phantom10 with operator. You might need to double that cost once you factor in enough lighting for a studio shoot.