AWS offers several pricing models, and among these, EC2 Spot Instances can provide the required scalability at a cost-effective price point. Spot Instances allow you to bid for unused EC2 capacity at a potentially lower cost than On-Demand Instances. However, these instances can be terminated by AWS with a two-minute notification if the capacity is needed elsewhere. This requires your application to be stateless or able to handle interruptions. Using Spot Instances can offer significant savings for workloads with flexible start and end times, which aligns well with the need to handle variable traffic during holidays. On the other hand, Reserved Instances require a commitment to a specific instance type and usage over a period, typically one or three years, which may not be suitable for the variable traffic described. On-Demand Instances provide more cost-effectiveness for steady-state usage, and Savings Plans require a commitment similar to Reserved Instances but with more flexibility in how the compute power is utilized.