The Carl Junction Post Office has been selling Breast Cancer Research stamps this month with $0.10 of each $0.45 stamp going to cancer research.
The stamps are sold year round, but the competition ends Wednesday.
As of Tuesday the Carl Junction Post Office is third in the nation, raising over $21,000.
Postmaster Sharon Clark, a cancer survivor herself, says it's a great program.
"I would love to find a cure for cancer and of course this helps fund a fight for a cure and then the competition itself - I just like to be number one," says Clark.