Buy Sufjan Stevens' Songs for Christmas for $15 5 CD Box Set (+S&H) here.

Here's what you can do:
Play Sufjan Stevens' A Christmas Game (by Tom DesLongchamp)
Create a Sufjan Elf E-Card (courtesy of iAppeal Media)
Print some ornaments for your tree (thanks, Laura Park!)
Listen to Sufjan Stevens' Songs for Christmas for free
Download free Sufjan Christmas ringtones, created by Leeni
Download free Sufjan Stevens MP3s
Watch "Put the Lights on the Tree" (by Tom Eaton)
Watch "Put the Lights on the Tree" by the International Class Grade Four