$$ Cost on a disc brake change $$

I currently have drum brakes all the way around on my Dart, my buddies keep telling me I need to switch over to disc at least on the front. To keep the cost down I was hoping to change over to SBP discs so I can keep the same wheels and tires. My question is, what is my total cost going to be on this type of conversion. Is there a kit that I can buy or do I just need to start collecting parts? Thanks in advance for advice and comments.

Rich, any updates?