For the following company, what sourcing strategy should be used? How would I analyze this case for the buyer's determinants of value, analyzing the buyers' market competitiveness, the purchasing power of ToyDolls, the Categories matrix, a clear explanation of the strategy.

Toy Doll's Company is a toy manufacturer located in Newport, KY. You are the purchasing agent in charge of sourcing packaging and services. Your current cardboard supplier has been facing quality and capacity issues, and you need to develop new sourcing alternatives as soon as possible. After a preliminary investigation, you ended up with four potential suppliers for card boxes. You requested them to provide a quotation based on your forecasted demand for your products. You forecasted 1,000 boxes per month for 2023, and 1,500 boxes for 2024 and 2025. You plan to get weekly deliveries as you don't have enough space to store them in your warehouse. You received the following quotations (all prices include freight door-to-door):