I purchased the Valentine Mailboxes cut file from Cricut.com. This is a Cricut Craft Room exclusive, so you either have to cut it from a Gypsy or by using Cricut Craft Room on your computer.
I used Scotch Quick Dry glue on this, but a hot glue gun would probably be easier when you get to gluing the top on. I plan on making another one for Meghan's preschool teacher, so I think the next one will go together easier. I cut this at 5".
The sentiment is from the K Andrew Designs "Of Mice and Little Men" stamp set.