Here is a rough guide to how I have priced tattoos in the recent past.
Some factors that can impact pricing include: guest spots, size, complexity of design, placement on the body, design revisions, colour saturation, if the design is already drawn (i.e. flash) as opposed to a custom design, coverups, and whether or not it is something I am looking to add to my portfolio, among other factors.
Here are some examples:
$160-$250
$250-450 b
$450-600 c
$600-750 d
$750+