Emusic has been offering this trial for a while now. I think back in the old days the selection at Emusic wasn’t that great. I usually stick with Amazon and iTunes (if I must), but after looking for this one song for what seemed like forever and finally finding it only at eMusic, I signed up for the trial. Now I’m not a believer in monthly fees, but as far as the trial goes in itself, it is fantastic. Selection still has a few holes here and there, but it surprised me how good it was. You can’t go wrong, unless you forget to cancel at the end of the week.
As always, good luck!