As per the 11 May 2019 board minutes (condensed from some historical
discussion):

Our policy is that the person in charge of memorials, and sending cards
to people in the hospital, etc., is authorized to spend $50 plus shipping
on flowers or something else suitable. The reason for "plus shipping"
is that we want to send the same quality thing regardless of how far
away the family/friends of the deceased, or person in the hospital, is.
The choice of "something else suitable" is left to the discretion of
the person in charge. Donation to a charity of the family's choice is
noted as a possibility.