Store

The Space Tree store was a webstore hosted on Keenswag, a now defunct website run by Keenspot, where their content creators could sell books, T-shirts and toys of their comics and animated cartoons.
The only Space Tree product ever sold on the store was an official Space Tree T-shirt, which featured the below design and product information:
Description: A Black T with Space Tree on the front with the text: SPACE TREE THE SPACE TREE IN SPACE!
Number: #16251
Price: $17.95 / €15.62
A link to the store was included on the home page of spacetree.com, and the shirt was advertised at the end screen of several episodes.
One of the kids in the Space Tree Action Figure commercial from Ash Hole can be seen wearing the Space Tree shirt.
One of the lines spoken by the Space Tree Action Figure is 'Mama mia, buy a shirt!' which is a reference to the official Space Tree shirt.
In Hand Shake, an alternate "SPACE TREE THE SPACE TREE IS DEAD!" shirt can be seen for one frame.
In 2021 Ed Atlin was asked whether he had any remaining Space Tree T-Shirts, which he confirmed he does not. No surviving specimens of the shirt are known to exist.