Set a significant % change for price drops
Sometimes mails show really only cents/ pence price changes which isn't greatly interesting. If we could set it to 5 or 10 % drops it could make a more actionable list.

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pants commented
I think this is a really good idea, other price monitoring sites have it.
But instead of a percentage I think it might better to say once the initial value has been met only notify after each 'x' amount of subsequent price drops.So if the price started off at say $10 and dropped to $3 that would be a 70% drop. But if the price then dropped to $1.50 that would only be a further 15% drop. Alternatively where a price is already very low setting a percentage could still result in a lot of mails coming out.