From The Daily Beast (link):
The homeland security market for state and local agencies is projected to reach $19.2 billion by 2014, up from an estimated $15.8 billion in fiscal 2009, according to the Homeland Security Research Corp.
The rise of equipment purchases has paralleled an apparent increase in local SWAT teams, but reliable numbers are hard to come by. The National Tactical Officers Association, which provides training and develops SWAT standards, says it currently has about 1,650 team memberships, up from 1,026 in 2000.