A blended retainer hides the thing you most need to see: how much of the money is going into which discipline. Two agencies quoting the same monthly figure can be proposing almost no overlapping work.
We are not going to publish price ranges we cannot source. What we can do is describe how the cost behaves in each discipline, because the shape of the cost is the part that tells you whether a quote is plausible.
Work through it in this order
Local
Front-loaded, then low. The profile audit, category work, services and citation cleanup is real effort once; maintaining it is not. A retainer that charges the setup rate forever is charging you for work that finished.
Owned by Local SEO
Technical
Project-shaped, not monthly. Crawl, indexation and Core Web Vitals work has a beginning and an end. Ongoing technical cost is monitoring, which is cheap.
Owned by Technical SEO
Content
Genuinely ongoing and the largest honest line on most retainers. It scales with how many services and areas you can fill with something true.
Owned by Content
Links
The line most likely to be volume sold as value. Ask what specifically would be built and who would link to it. A number of links per month is not an answer.
Owned by Link building
Attribution
Small, once, and almost always skipped. It is the cheapest line on the quote and the one that decides whether the other four can be judged.
Owned by Tracking and attribution
Ask any agency to split their number five ways. An agency that cannot is either not planning the work in those terms or would rather you did not see the split.