Random thought: an online store for items of questionable value that doesn't show you the price of anything, but does let you haggle.
The hagglebot should have a variety of colorful phrases and under certain circumstances be willing to counter with a price higher than one it previously suggested or take insult at an offer and turn customers away.
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It would be an inconvenient and unfriendly approach to e-commerce that people might just try for the novelty aspect.
