So I'm considering running one of the earlier (1-3) Harry Potter games on PC. From a quick google search the only way I see to buy them is through Amazon. Is there any way to buy these games digitally, or is purchasing a CD my best bet? Also is there anywhere in particular you would recommend buying them from?

Edit: While I'm posting here, does anyone have a recommendation on which of the first 3 games to run if I did?

You're best off ordering a CD from Amazon. And I'd recommend HP2 PC to start with; it's the most popular Harry Potter game and it's a fun speedrun.