Yes, I have a link to a sample contract on my site. The contract is actually here:
http://www.thehousedoktor.com/Contract.htm
It is a sample provided by plowking35.
Remember, this is just a generic contract. You can adapt it and tailor it to suit your needs. There are many different formats of contracts. Some are many pages long, and others are only one page. You need to find what works for you. The best thing to do is take a look at as many different ones you can, and write your own using elements from each of them that suit your situation, or particular account.
SIMA provides it's members with a few sample contracts, and members are very willing to help other members, especially when it comes to wording contracts. The MDLA also has a sample contract for it's members to use. They are a Detroit based Association.
SIMA
http://www.sima.org
MDLA
http://www.landscape.org
~Chuck