That got me researching a bit more and I found out that the fastest high-speed camera has the ability to take pictures at a speed of 200 million frames per second.
Just to be clear... when you record something at high speed, per say 1500 frames per second, the slow motion effect appears when you play those 1500 frames at a normal speed of 30 frames per second. But if you recorded at a whooping speed of 200 million fps and decided to play it at normal speed, it would take you 77 days to watch the whole recording (77 days to watch the 1 second long footage). Now THAT is slow motion.
Actually, the image above is a video, so if you come back every day for the next 77 days it might change slightly.
If you're interested in this topic, I recommend watching the following video:
Skipping Slow Motion from photography-factory.co.uk on Vimeo.
Also, I found this on Amazon: Casio EX-FH100 10.1MP High Speed Digital Camera with 10x Ultra Wide Angle Zoom with CMOS Shift Image Stabilization and 3.0 inch LCD. It can record at 1,000 fps, which is not bad at all, and it appears to be affordable at $300.