There are quite a few Flip cases (Non-window) on online retailers (e.g. Amazon, eBay), however I've experienced 'not so well' quality ones. This included poor quality, cases that haven't fitted or the cover wouldn't fully close when faced upwards.
If you are also looking for a flip case (Non-Korean version) with a cut out for the Notification LED, it'll be pretty difficult to find one.
Sorry for the negative insight on this, but best of luck to you finding a good flip case ^_^.
Current device: Oppo Find 7 (x9076)
'Diverse Ex-devices': iPhone (Original), (iPhone 3G, 3GS, 4, 4s) Black, iPhone 5 (White), LG G2 (Intl. White), One Plus One (Black Sandstone)
Tablets: Not mainstreaming atm. (Until I find the 'prefect' one)