I’m trying to budget for link building services, but I’m seeing a huge range in prices. What’s a reasonable amount to expect to pay for quality link building? Are there any pricing models that work better than others (e.g., per link, monthly retainer, etc.)? If you’ve invested in link building before, what kind of ROI did you see? I want to make sure I’m not overpaying, but I also don’t want to cheap out on something so important.