What's the Black Friday customer acquisition cost?

As an e-commerce business owner, I'm trying to understand the realistic customer acquisition costs during Black Friday, one of the most competitive shopping periods. I want to know how much I should budget for advertising, what benchmarks I should expect across different industries, and how to optimize my spending to maximize return on investment. With rising ad costs and increasing competition, understanding precise acquisition costs is critical for maintaining profitability during this high-stakes sales event.