I clicked the link that
@plantladylin listed in her post. It took me to the website for 'Gardener's Supply Company'. Website says they are a B Corporation. Direct quote: "B Corp, a relatively new corporate designation that combines bottom-line profits and social responsibility."
Also says that they are on Facebook and Twitter (in case you're interested.)
Saw that aside from a lot of products that they sell, many of which are on sale, there's a place to sign up for email. Also, they have a number of gardening advice articles. Didn't read any so can't comment on them.
When I entered 'newsletter' in the Search field, it didn't find anything.