Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
WHACO! aims to even the playing field for Scripophily collectors
by providing information on the hobby and maintaining a database of prices realized from auctions for members to reference online.
WHACO! Sample Database - WHACO! maintains a database of prices realized on key political and financial autographs and classic stocks, bonds, and historic certificates for members.