Dear Customer,
As one of our most special and preferred customers, I wanted to give you something really wonderful for {Holiday or Occasion}.
Instead of sending you some card or a box of candy, I thought I could give you something, which hopefully, will be much more appreciated...a gift of {benefit of your product/service}.
That's why I decided to buy you a {product/service}.
These {products/services} are normally {$xxx}, but it's my gift to you for simply being a valued customer.
{Description of free gift along with benefits -- A glycolic peel will help eliminate wrinkles, sun damage and other signs of aging. The peels are great, I use them myself and they really make a difference in my appearance.}
This letter entitles you to one free {service/product} at {your business name} in {your city}.
There is absolutely no catch and there is no obligation to ever use their services again. This is just something I thought you would really enjoy.
Just give {your business name} a call at {xxx-xxx-xxxx } and ask for {your name} to schedule your {product/service} and tell {him/her} you're the person I bought a {product/service} for.
Thanks again for all of your business this year.
Sincerely,
{Endorser's Name}
P.S. Remember, there's absolutely no strings attached to getting the free {product/service}. It's my gift to you for being a preferred customer.