Haggling is tiring and mostly useless considering the time and energy expended. There's a reason most shopping has gone towards standardized list prices without negotiation, and this happened way before Amazon existed. Even the large purchases like cars and real estate are trending towards upfront pricing now.

Now recommendations by a store expert are a different thing, but local businesses are again limited by recommending only what they have in stock, not what's actually best for you. I've rarely found anyone who would actually tell me to go somewhere else to get what I need.