Older models now on big discount straight from the Bluesound site direct. Claim on the 2i is that they garnered increased performance from working on some pricier NAD offerings like the new C-658.
New Bluesound's Node 2i
https://www.crutchfield.com/p_813NODE2IB/Bluesound-Node-2i-Black.html?tp=63339&awkw=586297302367...
Here's why the Node 2 was on sale and so many are available on the used market.
Here's why the Node 2 was on sale and so many are available on the used market.