Do you use well water?I could not get anywhere near 400G with an RO buddie, 200 if I was lucky. They have changed them some since I owned one, but I would not be looking at anywhere near 400G gallons.
Yes BRS is Bulk Reef Supply, I got a great deal on their 4 stage water saver plus unit. Which it seems they no longer make as I could not find it on their website.
I would imagine with this pandemic going on, a lot of vendors have low stock of a lot of stuff.

