I wonder if it is possible to get the graphics for the logo finally settled on put into such a file that it can be down-loaded with a PayPal payment to this site? Automate it all.
That would remove the necessity for someone (Gary!) collecting the money, making the stickers, packaging and posting the sticker .. etc. and also deny the Postal Services even more revenue from the Opel Community - they get enough shipping parts.
These days it is possible to print these things out on to adhesive vinyl in a laser printer at home.