how much must an item cost for it to be possible to have rights to cancel?

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I did not understand what you wanted to say in this question. It will be better if you could explain your situation. It will help me to answer your query in a better way.

Sussane

you don't have a right to cancel unless it specifically states in the contract that you can no matter the price of the purchase.
the right of rescission is a law that allows for a 3 day period to cancel on a refinance of a primary residence only.
you can always try legal action if you feel you were taken advantage of.