try checking out www.wantfrieswiththat.net
I dont know about the christmas tree but they have various other designs and a slew of other interesting stuff as well. I just ordered the one with the ufo on it for new years.
Yea there is a really cool place on line at www.clubtoys.com they have shirts and all kinds of cool rave stuff - really cool glowsticks etc. check them out \ they are sooo cool!!!! and the stuff is really reasonable - i got a box of glowsticks for like for like 20 bucks rather than paying 5 bucks at a club for 2 i got like a box of 20 for 20 bucks pretty good!!
Happy Holiday!!!
boni