Streaming to Multiple Systems around the house

I'm trying to set up streaming  to 4 separate systems in different rooms. Can anyone advise on my best budget option for this?  My budget is preferably <$400 total.  Some background is below - but I'm having trouble figuring out how to connect this all.

I have a Bluesound Node 2i attached to my living room system and direct attached to the router.  So far I have broadcast via bluetooth to my downstairs systems, but it gets dicey in a couple of the rooms down there.  Things I am considering are as follows:

1)  Longer Range bluetooth receiver (does on exist?) to connect to my Node 2i

2)   another cheap streaming unit separate from the Node 2i.  I was looking at some <$200 units, cheapest being the Dayton wba31

3) a second Node 2i downstairs, broadcasting to bluetooth in other rooms (would allow direct connection to the primary system down there with BT connection to the office and shop systems.

thanks in advance