Why so few speakers have their price listed online

Hi,
For the last couple of days, I have been trying to research which speakers cost how much and which are in my budget. To my dismay, very few speaker companies put the price of their speakers online. And if I try to track the dealer websites, they too provide a phone number to make a call and not the price.

Why don't the speaker manufacturers make the whole process of buying more transparent? Now I get the feeling that if I try to buy their speakers, they will charge me more. 

Although I must say that some manufacturers do so. But they are fewer in number. The same is true for most speakers related components like amps etc.

This is the exact opposite of headphones, where generally you expect the price for all components to be listed online.