Entronik via Amazon offers Prime members the Aduro Liqua-Shield Folio for iPad, model no. AIP2-SSP10-KCS, in four colors (Black pictured) for $20.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $8.80.) That's the lowest total price we could find by $3. It's compatible with iPad 2, 3, 4, Air or mini, and features a spill-proof Bluetooth keyboard, approximately 4.5 hours charging time, and a USB cable.