There are alot of people that will retrieve swarms of bees from homes, trees, etc. and not kill them - their is actually a market (a small market) for wild honey bees like that. You should look around your area and see if their are some beekeepers who can help you out. Where I live in Boston, I recommend http://www.ebeehoney.com/zMA.html and especially http://www.essexcountybeekeepers.org/swarms/swarms.shtml.
But either way, I really encourage you to work with a bee keeper. The bee populations are dwindling, a swarm is very valuable due to colony collapse disorder. Whatever you do, don't just kill them!
But either way, I really encourage you to work with a bee keeper. The bee populations are dwindling, a swarm is very valuable due to colony collapse disorder. Whatever you do, don't just kill them!