The Internet Legal Research Group has a web archive with a many legal forms that are available for free download. Many of their forms are state-specific (such as power of attorney forms, corp. and LLC formation, etc.) but the RE purchase contracts I see there with a quick look don’t seem to be state-specific. At any rate, the site may be helpful and you should take a look:
http://www.ilrg.com/forms/index.html
Good luck!
