Etsy
Here you used to be able to purchase video synthesizers i made, currently sales are only intermittent and require signing up for this list to be eligible
Redbubble
I think these might be a bit better quality than the teepublic stuffs! Will most likely be migrating over here over the next month or so
Tee Public
Here you can purchase some silly clothes and whatnot
If you appreciate the public domain open source software and educational materials I provide and can afford to spare some cash it is highly appreciated! The more donations I recieve the more time I have to spend on developing these resources! Please also consider subscribing to my patreon page as small amounts of regular income are appreciated as well!