I cannot say it as dirty but I do know one small interesting tactic.
My father’s business is of manufacturing trousers and selling it in wholesale.
Credit
Usually whenever customer comes to shop we tend to show him all range of qualities. When he is over with selection he asks what is the price of this item say X. We tell him one price for example 500 INR per piece.
Scenario 1. When he says it is very costly and asks us to reduce the price.
Note that when he asks for reduction in price it is understood that he likes the range of item and he is interested.
When he asks for cost reduction we tend to say him “this range of item cannot come in that price, we will show you similar range in low price but there is no guarantee on that low price item”
He then agrees to buy for the same price what we said initially.
Scenario 2. When he says to show the low cost item, it is now understood that he is not interested in that item and now we show same item but different colour or range with lower price.
It is very rare that buyers go for some low quality said items.