Q. Where can I find a template for a letter of intent to purchase a company?

Here is a list of links dealing with letter of intent to purchase a company.  Take a look at them all before you make your selection because there is some variation from one to the other. If you require more detail than what is offered here free-of-charge, you may have to pay for it.

http://www.buzzle.com/articles/sample-letter-of-intent-to-purchase.html

http://pdfdatabase.com/search/sample-letter-of-intent-business.html
Type "letter of intent" in top search box.

http://www.jian.com/software/business-contracts/sample-contract/Letter-of-intent-purchase-acquire-business.pdf