Dear Dean,
This is to express my great appreciations for you having provided me the best products and the best service ever!
I know you guys are located quite far from where I am, but you have always made your best efforts to come down for everything that I need.
I cannot be more grateful for all you have done.
I am so going to refer to my clients and my friends who ever want to have the same sorts of products.
Thank you so much again and wish you all the best.