Here are samples and templates of sales introduction letters. These examples help make a professional impression and begin the sales cycle.Arizona Free Letter of Intent ( LOI ) Template. Utilize our Letter of Intent to formally express your desire to buy a product or service. Make the letter clear and include only the details that describe the problem and the resolution you want. The sample letter below might help. Customer: Hi, I have prepared a demand letter to be sent in Arizona for civil business matter. Arizona transaction privilege tax (TPT) is a tax on the vendor for the privilege of doing business in the state.