You can purchase your own Catchbox. The version we are using at York University is the Catchbox Lite version.
The vendor sells them directly, and will apply an Educational discount to you.
The units will work in the classrooms provided you purchase an XLR to TRS cable to connect the receiver to the XLR jack in qualifying rooms at the University.
While we do not specifically endorse any one brand, the one we have used with all of our kits is the Digiflex CXMS Canare XLR Male to 1/4" TRS Adapter, at 10 feet long.
The connectors look like this:
If you have any questions, please let us know by reaching out to us at firstname.lastname@example.org.