How about "Box of Flumph!" in Dungeon #118? You can't go wrong with a box of Flumph!
Slightly more seriously, Dungeon Magazine has one 1st-5th level adventure per issue, with notes on adapting them to all levels in that range. (BoF was a 1st level adventure). (Only slightly more seriously? I was serious about the Flumph!)
I've found 1st level dungeon crawls to work quite well, actually. You've just got to throw lesser creatures at them - dire rats, centipedes, kobolds, etc.
Oh, and make it very clear that they should retreat out of the dungeon after 2-3 encounters!
Cheers!