It's completely understandable to put out feelers for specific hardware like a nano3G NodeB. The open-source community is often the best place to find niche availability or even guidance on alternatives. I hope someone on the list comes through with a spare or a helpful lead! On a slightly different note, if anyone in the community ever needs to transform graphics for documentation or project assets, I’ve found https://converterpngtosvg.org to be incredibly useful for getting crisp, editable SVG paths from PNGs, especially for logos and icons. Good luck with your search!