One of my clients is a small school district in Texas. Like any school, they often have problems with network'd peripherals such as printers, et al.
It would be nice to be able to simply "listen" to what the printer and PC are saying to each other (or not saying more importantly)... The problem is that I can't find old-style "hubs" anymore, and even if I could, it's not a long-term solution.
All of the devices that I have found to replicate the purpose of a simple hub are either $100+ or are difficult to throw into a networking tool kit (aka my backpack)...
Now that hubs are dead, what's the new low-cost standard for simple packet capture in the networking world?