Irk then tells a few thousand of his closest buddies to keep checking the merchant for price updates.

Irk's friends phone home when they see the website has changed from what was stored in their original cache.

Irk takes the snapshot of the website and filters it for price, shipping, product weight, refurbish/retail and rebate information and puts it into a database.

When you visit RTPE, Irk guesses what state you're in and attempts to verify if you will need to pay shipping or taxes.