Where can I get another copy of RTW/BI Two Games in One Disc?

[Emperor Tom]

So I have 2 copies of these two games because I have been playing them heavily for the last 9 years. The disks are getting worn down, and I do not apologize for this! I love these games and I have the Gold Edition with RTW and BI and then I bought the Eras Set. I prefer the eras set because of the two in one disk makes it easier to install and easier to mode BI so I can play as the Berbers, Roxolani, and Lombards. For some reason I cannot get them to become playable in the regular BI but I can for the Eras version. Anyways I wanted to know how to find another copy like the Eras disk so I can keep enjoying these games once they can no longer be read for over playing them. Thanks!

[Bonez]

Steam, no discs so they never wear out. Plus they come in the one set together in the gold edition. Its $10 for that and Alexander.

[Emperor Tom]

did not know that. thanks for letting me know.