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I can't imagine there's just ONE "best" price to pay for SEO services. Some companies charge more because they are larger, have more employees, more resources, more lights to keep on, more expenses, etc... and some charge more for their expertise. I'd say use your common sense. $1,500 per month for SEO seems outrageous to me. If you call 5-6 companies and 3-4 of them are charging around $400, that would seem like a reasonable price to me. SEO is intangible and very hard to put a specific value on.