You're looking at zazzle.co.uk's Periodic postcard page, where you can find a fantastic range of Periodic postcards, ready for customisation or to buy just as they are. Make your message extra special by customising your Periodic postcards with your own unique designs, pictures and text. To see some of the other products available on zazzle.co.uk, check out our main periodic page. No minimum order size. Most postcards are made within 24 hours in the UK and are delivered within 2-3 days!