I found some things here:
http://postgresqleu.spreadshirt.net/
Don’t know if it is the best place but may help.
Bye
Charles
From: pgsql-advocacy-owner(at)postgresql(dot)org [mailto:pgsql-advocacy-owner(at)postgresql(dot)org] On Behalf Of Jay Payne
Sent: Samstag, 11. Juli 2015 18:44
To: pgsql-advocacy(at)postgresql(dot)org
Subject: [pgsql-advocacy] Stickers, T-shirts, etc
Where is the best place to get PostgreSQL swag? I'm planning a series of tech talks and would like to give some things out to a few of the people that attend.
Thanks
--J