Legally, if the mistakes are blatant errors, like listing a $1000 card for $10.00, a seller is usually able to cancel a transaction based on the obvious mistake. An objectively clear mistake is grounds to rescind a contract. If the numbers are a lot closer than that, though, like $650 instead of $1000, and the mistake is one of degree, it is a lot harder to prevail.
That said, from a customer relations perspective, canceling orders and telling a customer "too bad" is a poor idea. When I make a mistake with a client I do some sort of make-good.
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