I have on several occasions highly recommended buying from www.interactcd.com
in the US. The speed of service and excellent postal rates (7 US dollars without box - 10 US dollars with box) is terrific value.
Have a look for yourself and I know that you will be totally satisfied if you give it a try.
Courteous, prompt and totally reliable service which is second to none.
A couple of years or so ago I was ripped off by FedX and avoid it like the plague. Interactcd send the packages by air mail and not once have I been stung for VAT over here which I was when packages came via FedX.
Hope this helps
***PS If you go to this site via the link above, click on 'PC Games' at the top of page then scroll down to 'adventure games' and other listings