How to research COGS and price?

I am currently trying to test out my business model by estimating my potential margin and auals sales.

My current method is to manually scour dropshipping/wholesale platforms for a product that fits my model and then finds its selling price on a set of online stores (bottom price (amazon), medium brand, luxury brand).

My challenges are:

• finding brands that fit with my business model (high quality stem toys built in developed countries)
• efficiently searching...

How to research COGS and price?