isthereanydeal.com has a bundle history feature at the bottom of every game. shows date available, name of bundle, site that was offering it. price if applicable. would be good to see here so I know even if a game doesn’t go on big sales, it might appear in a bundle, like this recent Capcom one for Kunitsu-Gami.
Love the bundle page on this site, just wish on the game’s page you could see previous bundle history rather than just the current bundles at the top.