Oil pens are very popular for people that are using concentrates to vape with. When it comes down to buying a cheap oil pen vaporizer for sale online, you need to decide which will be the best for you to operate. Finding out the most important thing about an oil vape pen is something you need to figure out before you buy a new oil vape pen. The way an oil pen operates is from a wick or coil that slowly feeds the liquid oil into the coil to give you fresh aromatherapy sessions to begin the vaping experience. Oil vape pens are becoming a household name, everyone wants them and people are buying them.