Yankees Universe helps kids:

... The Yankees, along with the Memorial Sloan-Kettering Cancer Center, announced Monday a fundraising initiative to support research and treatment for children with cancer. They will be selling limited edition "Yankees Universe" T-shirts with all net proceeds being donated to the newly established Yankees Universe fund for pediatric cancer research, education and patient care at Memorial Sloan-Kettering. ...

"This is the Yankee universe," [Dr. Richard O'Reilly, chairman of the department of pediatrics at Memorial Sloan-Kettering] said. "And as far as I'm concerned, there's no better place to be."

They are on sale at Yankees.com for $20 each, plus $5 shipping for the 1st shirt and $1 for each additional shirt. (Shipping rates for shipping to the lower 48 states, others are more expensive). They are available in dark blue with white text and gray with dark blue text.