I came across this new Amazon price tracker https://keepa.com that's really impressed me.

It's awesome because their graphs show the lightning deal pricing and frequency and also they've been emailing me "lightning deal alerts" up to 24 hours ahead of time so I've been saving good money on half dozen tech items already. They even have Chrome and FF extensions that show the data inline on the Amazon product page.

Hopefully this lightning deal feature remains free as long as possible (they charge a subscription fee for other Amazon sales data).

Cheers all!