Geojoek, "$200+ for an arborist throw line launcher!?!? I can make my own for $20".
It.... kind of works? (Video in thread).
The surgical tubing I bought isn't quite robust enough and it turns out pouches to hold the throw bag are a whole school of engineering unto themselves. I ended up spending $35 on a replacement pouch + tubing from an actual arborist throw line launcher. So am in $55 but that's still a lot cheaper than buying one.