Consumer affairs need to heavily fine misleading and deceptive statements, triple that if the cause claimed is specific but untrue in descending order of cause.
If Amazon said, import duties, transport, distribution costs, decreased discounting, interest costs, return costs, compliance costs, then yeah, fine. Or even bulk deal and old stocks have run out. Or claim it was a loss leader. They know their own buy cost. And they dont want to tell consumer affairs when the PR department make over the top generalization's.
But speakers have garden variety electronics, and el cheapo parts, and a 30 cent mcu. Clearly memory was NOT a cause on low end bucket speaker boxes. plastic, made from oil, probably did raise the production cost in China. maybe they used up all obsolete bluetooth 4 modules, and the latest bluetooth chip cost 60 cents more.
Honesty is best. It is no secret that when helicopter covid money landed, retailers all raised prices on flat screen TV's because they could. Raw computer memory did triple in price, That is true. Bust so did the humble USA letter stamp cost. Transport is the biggie.