You must consider the cost per copy with any printer. This includes the medium you print to, the cost of ink cartitridges/ toner and also the cost of repeated copies.
Color printers are always more expensive to run.
Inkjet Cartridges can be refilled several times before they start to deteriorate.
Some paper absorbs too much ink. Best to use compatible paper.
Replacement cartridges are always more expensive from the manufacturer. There is a variety of 'compatible' carttridges available for popular printers.
Myths
Don't believe the (pages per minute) ppm rate advertised. The speed of a printer depends upon how much there is to print out on a sheet and the type of paper being used.