Hi benchrest,
Here are a few suppliers of Mailboxes, please check them out:
Link hidden: Login to viewLink hidden: Login to viewLink hidden: Login to view - their mode of payment is not specified in their website. So please don't forget to use safe payment methods, in case you do order from them..try to use either Paypal or a credit card.
Hope you'll find the mailbox you're looking for.
Cheers! :)