Actually, Simon, that is the gift exchange.
For cards, on the 14th I will PM everyone a copy of the list so far (perhaps with some additions after that).
I send you the list of all those participating and you send each of them a card of your choosing or electronically if they choose to supply an e-mail address and you know how to send electronic cards.
Last time only 14 people participated, so it is the cost of the card, postage, and your time.
It is nice to get cards from different people with a little note of your value here on the board. This year, no card for Grace, which is sad for me. But time marches on for all of us. I hang mine on a cord attached under my fireplace but I have seen them attached across a window, or stood up on a table.