Christmas cards. Are they really necessary? A few years ago, because just about everyone is on email anyway and postage plus the cost of cards is extortionate, I opted to send an annual summary of what we'd been up to, by email, BUT, asked them to not send us a card either and I pay $5 per card I DIDN'T send, to a favourite charity.
Charity wins. Post Office and imported card sellers lose. Better for the environment.
I do personalise for some specific people and also some specific groups - like cruisers!