Randy,
Your information is wrong. There is no question of something like this being supported only via a paid plugin.
Is this only supported by have the paid supplies module?
Even the Supplies module does not support visit label printing.
Supplies module supports Kit barcode printing. The distinction between a kit barcode and visit label might be a bit confusing since the kit barcode is mapped to a visit label at a later point when the visit is created.
However, it is not the same as printing a visit label. In some of the wiki pages for Kits, it was wrongly referred to as “visit label printing” instead of “kit barcode printing”. We have fixed it.
However, your point is valid. We will consider this in upcoming releases (in the standard package; no plugin needed).
The reason why it is not supported is simple. Not many have asked for it.
~Sri