The four options, plainly
Each has a real cost. The comparison that matters is cost against the bottleneck you actually have.
- In-house with a tool: cheapest in cash, needs one person with hours and the authority to publish. Fails when that person is already full
- One-off audit, executed internally: buys direction without a retainer, and the plan is only worth what your team can carry out
- Contractor on a defined project: buys hands for a fixed scope, with continuity risk and no cover when they are unavailable
- Do nothing yet: correct when the site cannot be crawled, when nothing gets approved, or when the product has no buyers to reach
- Agency: worth it when the constraint is capacity, the scope includes execution, and you need several skills at once