Where can I get all the old Disney games / game collection / packs?

https://en.m.wikipedia.org/wiki/List_of_Disney_Interactive_Studios_gameshttps://en.m.wikipedia.org/wiki/List_of_Disney_Interactive_Studios_games

Check Humble Bundle periodically.
https://www.humblebundle.com/monthly?partner=zeosage

You can check eBay. There are similar collections sometimes.