Compatible non- bluesound streamer?

are there any wireless streamers on the market that can be grouped with a bluesound node2i on a roon network? with toslink out and inexpensive preferably. thanks in advance for the help

The Bluesound uses RAAT so you have a good choice of options - cheapest for optical would be an RPi solution from IQAudio (Pi-Digi+) or HiFiBerry (Digi+).

Edit: Forgot to add - for reliable WiFi you might want to use a cheap WiFi dongle with the Pi - I use [this one](Edimax EW-7811Un N150 Wireless USB Adapter Nano and can play at the maximum PCM resolution for my RPi units without any dropouts.