With orders of $25 or more, Sunvalleytek via Amazon offers its Prime members the DreSuit Arte Series Smart Flip Book Case for iPad mini in Red, Black, or White for $3.99 with free shipping. That's the lowest total price we could find by $19. It features a sleep/wake function, full access to all ports, buttons, and camera, and a built-in lock stand.

Note: This item is part of Amazon's "Add-on program"; it can only be purchased with an order of $25 or more.