Bunk Note credits are required in order to send Bunk Notes. Credits...
... typically cost $1 each
... are generally purchased in packs of 10
... are good for the entire summer
... are non-transferable and
... are non-refundable.
Camps generally contract for this service on an annual basis and, as such, unused credits *generally* do not carry over to next summer.
The cost (in credits) to send a Bunk Note to your camper is clearly marked in a box at the top of the Bunk Notes page. A standard (text-only) Bunk Note generally costs 1 credit to send.