Honeywell HZ-817 Space Heater
Rated one of the best for overall score as a natural convection, non-fan heater for whole rooms are quiet but a little slow.
The Honeywell HZ-817 space heater is a good choice.
Check it out at:

Honeywell Space Heater Model HZ519

If you really want the HZ-817, Amazon appears to have it in stock through one of the partner sites.