With blood supply levels critically low, the Marsh Regional Blood Center is asking for your help to donate blood while shopping at the Mall at Johnson City over the next couple of days to give back, without spending a dime. According to Amy Elsea, Manager of Marketing and Communications at Ballad Health, donors will also receive their first stamp for the winter promotion. If you donate blood or platelets two times before Feb. 28 you will receive a choice of a cable knit beanie.