You might want to check stickies in the Requests forum, I remember one has links to various online stores which tend to carry old games.
And hey, congratulations for asking. It's rare we see a new guy (gal?) ask about ESA this politely.
Usually they post ...things... like "ESA SUXXORZ!!! WHERE DO U DOWNDLOAD THIS GAME???!!! ONEONEONE111!!!".
You have a reason to be proud you're not like the majority
.