The Meike 50mm f/1.8 full-frame autofocus lens is now available also for L-mount. Orders are now open (price: $169). Shipping will start on July 15th. This lens was already released for E and Z mount:
Announced: Meike 50mm f/1.8 full-frame autofocus lens for E/Z mount
Meike lenses are sold also at Adorama, Amazon and B&H Photo.