It might be hard to find I picked it up along with Soldiers: Heroes of WWII for $5 each at an outlet store. Both of these games are hard on the nerves due to the small margin of error they allow. I have Commandos 2 and while I really wanted to get into the game I found it too frustratingly unforgiving so I moved onto other games. Not sure if C2 had a Quicksave feature but C3 does. Since you seem to be a fan I hope you can find a copy. If not there is always Ebay.
Pete from Canada