How do I find laser printer toner cartridges?

Laser printers have significant advantages over other types of printers. Unlike impact printers, laser printers can mix text and graphics, including varied fonts and character sizes, and halftone images. Laser printers use toner, a black or colored powder, rather than liquid ink. Unlike thermal printers, whose images can be smeared if the paper comes in contact with a source of heat, laser printers do not require special paper. Advantages of laser printers over inkjet printers include higher resolution, no smearing, lower cost per page, and faster print speed, since the entire page is imaged at one time, while an inkjet typically prints a series of narrow strips. However, laser printers always produce raster images, and except in the highest-quality versions, are less able to reproduce continuous tone images such as photographs.