If you'd like us to carry your work, the best thing to do is to send us an email with links to images of products and goods you'd like us to carry. We don't have any formal submission policies or any hard-and-fast rules about things we will or won't carry.
Even though we've been in business over 20 years, we are still a fairly small organization (on purpose), and we do our best to review each submission by hand.
But because we're a small team, and only have so many resources as far as time and space, we are often a bit slower to add new artists and work.
There's tons of great stuff out there, and we've had to say 'no' to things that we think are great, simply because we didn't have the time, space or resources to add them.