Die regeln des BGG Secret Santa sind da, ich stell sie jetzt mal hier rein, weil ja offenbar unklar war wie die das machen. Vorallem in diesem Punkt.
5.) You should buy at least one game for the person who you are giving a gift to. We do not set a minimum cost for the games you give, but you should expect to spend at least $50 USD on the gift (combined cost of game(s) + shipping). This is roughly what it would cost to buy and ship a new copy of Ticket to Ride or Dominion from your FLGS. There is no problem, of course, with going above and beyond - sending two, three, or even more games. The generous Santas are the best remembered! And you can make it truly special if you can personalize the gift somehow. Examples and ideas can be found in last year's geeklist:
http://www.boardgamegeek.com/geeklist/59662. Some really nice stuff has been given out!