You may want to visit www.charleysgreenhouse.com - they list some space
heater options and also sell a thermostat for portable space heaters.

John- Thank you for this website. As of last week I have already ordered my
seedling mat from Burpee, but the site you reference has quite a few other
things I have been looking for like humidity trays, straight perlite, and a
faucet adaptable watering hose.

Take care,

Tom.