I have had global light send a bottle to friend in France. He was interested in making it himself so I did some research for him. China is also a major player.
I would be very careful in being sure you are getting precisely what you want [sodium chlorite FLAKES] and not something else that they say it is. You should ask for a sample and perform the check that Jim Humble describes in book 2.
I do not have a business and have not ordered it myself. I've just gathered the information. I think ScienceLab.com [California] sells amounts up to 2.5kg for $300 + shipping. I would have to check on this to be certain.
ACTUALLY it looks like they raised their prices since the last time I checked it out. $400. + shipping
100LBS IS WAY TOO MUCH - $800 + shipping.
Finding a supplier in your home state would be the ticket and then pick it up yourself. Just form a business [DBA] and pay with credit card. If planning to go to canada to pick up and bring it across the border yourself, it would be wise to understand what the transportation regulations state about what the vehicle requirements should be, otherwise, you could get hung up at the border.