Here are a couple of good sites for Christmas trees, supplies, information  and good times.

In Illinois go to the Illinois Christmas Tree Association:  http://www.ilchristmastrees.com

Nationwide go to the National Christmas Tree Association: http://www.christmastree.org/

For not only Christmas tree information but also pick your own fruit and vegetable farms and just a whole lot other helpful  information go to www.pickyourown.org