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ISO7421: About lower cost digital isolator

Part Number: ISO7421
Other Parts Discussed in Thread: ISO7721

hi dear supporting team,

customer is sourcing for low cost digital isolator, the spec requirement is as below,  it seems the closest  solution on site areISO7421, but it is high rel, so do we have newer ones with lower cost?

1. 3.3V/5V power supply

2. SUPPORT RS232/485,  speed >=1Mbps

3. isolated voltage >=1kV

4. -40~85degree.

5. 2 channel, 1TX 1RX. 

6. around 1$ cost.  (volume higher than 100k/y)