What To Put Wedding Cards In Where Can I Find A Royal Mail Post Box To Put Cards In On My Wedding Day?

Where can I find a royal mail post box to put cards in on my wedding day? - what to put wedding cards in

I'm getting married and I would like a mailbox actual e-mail (2 to 3 feet tall, red, plastic, how, etc.) every day people who have their cards for us to miss, so you do not, you know, where you can search to a ?