Similar to the $3400 JL YVR-SIN fares mentioned upthread, there are some flights (very limited availability though) running from YVR-HKG for $2401 connecting in NRT on JL. Bookable. Sample dates: Sep3-Sep17 // Sep5-Sep16 // Sep19-Oct7.
Edited to add: these seats are not fully flat type but will be upgraded as of December as was announced in
this thread.