It depends on a few factors, size of your room, your budget and safety, in case you have small children or pets.
If you've a small room to heat, and on a budget, then the Optimus H-5210 is the best choice, you can still find it for under $30.
If you have a larger room, and want something a bit safer around pets and children, then the Dr Heater Quartz is still the most popular heater for under $200.
You can find reviews for the most popular brands here in the related link.
One could buy electric infrared heaters from shops like Saunacore. This shop specializes in sauna heater, steam bath, electric infrared heaters, etc.
You can try the Vent-Free Infrared Gas Heater taht is made for patios.
Valco Infrared heater can be used as a space heater. The can save you lots of money on energy costs.
You can buy an infrared heater online at Amazon.com or several other general shopping sites. Here is the link to a specific model: http://www.amazon.com/Fire-Sense-Outdoor-Wall-Mount-Infrared/dp/B001WH0924. You can purchase new or used infrared heaters on ebay.com as well as many other websites. The site http://www.infraredappliances.com/ is a leading website for infrared heaters.
Depending on what kind of infrared heater you want, there are many retailers that carry them. Home Depot has portable infrared heaters and infrared ceiling heaters. Safer Wholesale sells portable infrared heaters and patio infrared heaters.
If one's home is already heated, one can use a ceramic infrared heater for maintaining the heat. The ceramic infrared heater prevents the temperature of the room from dropping.
People can buy an infrared heater from various stores online, along with various high street stores. Online stores include Amazon, tlc-direct, ebay plus various other online stores. There are many models and customers should take their time to read and review before purchasing.
The Sunheat Infrared heater is a portable heater in a wooden encasing. It has infrared heat tubes and copper. There is a fan which sucks the air from the room and pushes it into the heat chamber. The moisture in that air absorbs the infrared heat and it is pushed out into the room, warming the room.
The infrared quartz heaters have the infrared emitters and they emit infrared rays continuously to heat the heater in the instrument. The heat is generated and infrared emission stops.
a quartz heater is otherwise known as an infrared heater owing to the materials of construction being mainly quartz
One can purchase a decent infrared flashlight from Amazon where there are many available to purchase between $20 and $50. One can also buy them from Best Buy and eBay.
The Sunbeam SFH436-UM Bath Fan Heater with Digital Timer is very light.