After the heady, sugary days of Christmas and Hanukkah, are you going through cookie withdrawal?

Girl Scout cookie sales start Friday in Illinois. It's the first time in more than 20 years that the Girl Scouts of Southern Illinois will sell cookies in January; they've previously sold them in the fall. 

This marks the 100th anniversary of Girl Scouting, which, of course, will be honored with a new cookie. Savannah Smiles are lemon wedge cookies dusted with confectioner's sugar. The name is an homage to Girl Scout founder Juliette Gordon Low, who was born in Savannah, Ga.

Tricia Higgins, a spokeswoman for the Girl Scouts of Southern Illinois, said cookie sales were moved to January this year because September and October are busy times for recruitment, registration and forming new troops.

She also said that "we were in a small percentage of councils that held their cookies sales" in the fall.

"The majority of councils hold their sales at this time of year, so we're able to benefit from the national branding and marketing that Girl Scouts USA does," Higgins said.

Girls Scouts of Southern Illinois begins selling cookies Friday. Each box of cookies is $4 and will be delivered Feb. 13-16. 

Girl Scouts of Eastern Missouri will begin selling cookies on Jan. 21. The groups use different cookie venders: Savannah Smiles will not be available in Missouri, but they will have Lemanades, a lemon shortbread cookie introduced in 2006. Each box of cookies will cost $3.50; they will be delivered Feb. 29-March 18. 

The Thin Mint remains the groups' top seller. The Girl Scouts also have a cookie-finder iPhone app.

Correction • This story has been updated with price and date information, and to clarify that the Savannah Smile cookies will not be available in Missouri.