It's an interesting loop ... the seller charges what he can get, the buyer pays what he must... prices go up and very little of it has anything to do with the quality or utility of the product.
For my friends and clients I define three price points...
First is the Average Price ... derived by looking across multiple similar products and seeing where that mid point pricing is.
Second is the Crap Line ... that stupid low price where you know they aren't producing a quality product.
Finally the Bling Line ... that ludicrously high price where you are paying for the name, the case or the packaging.
If you eliminate the Crap and the Bling from your purchases you are almost always left with a group of Average priced products that are well enough made and actually perform as advertised. From there you can narrow it down even more by eliminating products that don't have the features you need. ... and at that point you can be reasonably sure you're making a good purchase.
In audio there is the extra step of a Listening Session ... but with the brick and mortar stores all closing up on us that final step usually happens post-purchase these days... so make sure what you buy has a return window, just in case.