But she doesn’t seem open to the bid:

Move America Forward, which bills itself as the nation’s largest grassroots pro-troop organization, says it plans to buy the land near President Bush’s ranch in Crawford, Texas, where Cindy Sheehan has waged her anti-war protests.
The group said it plans to build a monument to America’s war heroes on the five-acre site. A sketch of the planned monument shows a pillar topped by a cross.
[…]
However, the Associated Press on Friday quoted Sheehan’s sister as saying “It’ll be a cold day in hell” before Sheehen sells the property to Move America Forward. “She’ll sell it to them for $5 million,” Dede Miller was quoted as saying.