Since I live in Bumf*k, the only dedicated software store here is Software, Etc.
Generally, boxed games cost around 5 bucks more than they are priced on the internet.
However, I have taken many games back for either credit or refund, with no problems, sometimes up to 30 days after the original purchase (the last one was B17 Flying Fortress II, released without multiplayer and never patched).
For me, at least, a 30 day free trial of WWIIOL is no problem.