The Sorcerer's Stone Rifftrax is pretty good, to judge from the oh, eight minutes of it I've listened to so far. A couple minutes of the opening, then straight to the Potions speech (you were expecting...?), which, actually, they let comparatively alone (more of the jokes are about the kids).
[Dumbles doing the Deluminator schtick]
Kevin [i think]: Yeah, call me back when it can steal your neighbour's cable.
[McGonagall in cat form outside 4 Privet Drive]
Mike [i think]: I can has wizard?
(that one made me literally lol.)
[Hermione with her hand practically touching the ceiling in Potions]
Mike: Yes, Hermione McButtkiss?
[Seamus doing the silly water-into-rum bit]
Mike: Can we get some subtitles for him?
So yeah, worth the $4, I imagine.
Ones with Kevin, Mike, and Bill really are my favourites because to the ears, it's just like seasons 8-10 of MST3K. All I need is to break out that little paper silhouette I got with my fan club kit lo those many years ago and stick it on the TV.