Will probably be kind of hard to find as Origin has completely bailed on "offline" titles. I don't know if it's possible to patch the DOS version into a Windows compatible or not (I heard of such a patch for Wing Commander III).

Your best bet is to try and find it at stores that deal in used software like half-price books (sites at half-pricebooks.com) or "Electronic Boutique" or similar stores. Half-price books has been good for me, but it's like a garage sale: don't expect a cataloged list of titles. You just need to walk in the store and start digging.