Answer: Thank you for your inquiry. Yes, Wooden Cedar Mailbox Posts have optional base sleeves. You may choose between fluted sleeve and raised panel sleeve.
Question: Can I use any post for a oasis jr mailbox?
Answer: Yes, however it may require the use of item 7530 which is an adapter plate.
Question: how much is the post package for liberty mailbox and ground screw?
Answer: Currently, they are selling for roughly $250.00. and can be found here http://www.budgetmailboxes.com/manufactured-by-mayne-post-mayne-liberty-posts.html