I only see a $2 difference for the 2XL shirt in the US:
Hoodies too:
And no upcharge in the EU:
Please ping me directly if you’re seeing different prices and I can iterate with Teespring.
If you’d like to make your own that’s fine too. We have a repository with most of the artwork available here for non-commercial use:
We generally want to make sure to be producing high quality stickers that will be crisply printed, stand up well on surfaces in daily use, and not fade over time. A lot of the vendors we’ve tried so far have not been able to deliver those requirements so we’ve held back from distributing them.