It is very difficult to determine if the specific attributes you need in a smart lock will be available in the configuration you purchase before you actually purchase it. 

Traditionally direct mail has a response rate of 1-3%, but in competitive markets it may be less than 1%.If you are going to do any DMM I recommend using very targeted niche lists and totally custom mail pieces as a way to stand out from the crowd.

What makes yours stand out? 

You have to stand out as "the deal".

Believe that within your market, that integrity will eventually stand out and put you ahead of the competition.

Yellow is the most popular, so maybe doing a pink or orange or green will help your piece stand out in the crowd.

I love reading (I tend to digest 2-3 nonfiction books per week between reading and audio, and 2 longer, more casual fiction books per month) and have always found that my writing skills have helped me stand out in any field.

They are very hard endeavors with every major MSA being saturated i.e. it is hard if not impossible to stand out. 

I think you might be able to find local printers that can do simple mailers/postcards, however, if you're really looking to get creative with your mailers so you stand out, I can almost guarantee there are only a number of print shops that can do this due to the additional cost of the mailers.  

With that: What are you doing to make your mailers stand out?