How to charge for subscription boxes?

Could you elaborate on the various methods of charging for subscription boxes, and the factors that should be considered when determining the pricing strategy? Is it more effective to offer a flat monthly fee, or perhaps a tiered pricing model based on the value or quantity of items included in the box? Are there any industry standards or benchmarks that can be used as a starting point for determining pricing? Additionally, how do businesses typically account for shipping and handling costs when setting their subscription box prices?