It's also worth digging into "the mistake" here, because it's very likely that no human made this mistake (and can be punished for it internally). Rather the larger system (machine or beast) that is Amazon created a pricing system that created this price. You can either take advantage of it or not. So the real question of applying the principle of reciprocity here is ... what is the entity making the mistake and being exploited?

Would you like to live in a world where Amazon creates systems that exploit the market but individual consumers feel moral responsibility to turn a blind eye to the opportunities created by the mistakes that that system makes because they project their own humanity onto the system and apply the golden rule?