Does one device have to suit all? Or are you putting one protection device per battery?
What you're speaking of is called a BMS, or battery management system.
If it's a fixed config, then they're pretty cheap, $20-100 depending on what current you want.
http://bestechpower.com/296v8spcmbmspcbforli-ionli-polymerbatterypack/BMS-D298V1.html
For 200A+ though, you'd probably want to put a relay in - so when the BMS cuts power, it cuts power to the relay instead. This will mean you only get protection for cell low/cell high and not for too much current being drawn though - but if you're drawing too much current chances are you will trip cell low anyway.
If you want one device that can be reconfigured so you have 1 protection device for as many batteries as you want, you need a programmable one, which costs an arm and a leg:
http://bestechpower.com/communicationbms/BMS-D170V1withRelay.html
That one can carry up to 500A continuous, 2000A burst, and 720v. (96S).