I used this site:
You can do it for where you make your pottery, or for a show you may go to. I started with three counties: Warren, Saratoga and Albany. I narrowed it down to people making over 60K a year, and homeowners whose homes are worth over 200,000. I also narrowed it between ages 35 and 70, because most people under 35 who I know are still getting settled and don't have a ton of disposable income for handcrafted works (and I may be wrong, but I had to narrow the 60,000 leads I had to that point!!) and over 70, in my experience as a shop owner, are trying to give their stuff away, not buy new stuff. Now, if I made a lot of funeral urns for remains, as does a woman I know, I would include them. (Macabre, I know. Sorry.) I picked people with some college, most religions except the very strict ones, and still had a lot of leads, too many to use.
Then I picked interests: animals, because I make the dog bowls and dog ornaments, wine and cheese, these people seem to be educated and have disposable income, travelers, finance interests (money,) arts, anything that I though would include people who would appreciate and be able to afford handcrafted goods. I still had way too many people, so I narrowed down my counties, and with 2 counties, had 3000 leads, which is too much for me to do, and with one county, had 800 leads. I can handle 800 leads.
The whole enterprise, list, postcards and postage, will probably cost $600 or so, but I have found it does help, right away, and in the long run. It's just another tool, but I like it because it is SO targeted to those who like what we have.
Hope this helps!!
(And sorry for the thread theft - I should have put this on another one.)