There's no right answer for that. It all depends on what keywords you want to target and what is your niche. Right price is only what you are willing to pay for desired results.
Thank you mqss,
all depends on the number of competitors in the targeted keyword.
How? Can you Explain me?
depends on the site
My site is about Education
If u have Low competitor keyword exists i charge nearly $200
If high then i charge $550
Thank you Nice man, I will contact you later