I'm heading to an industry event in about two and a half weeks, and I'm planning on interviewing several people while I'm there. My plan was to use my iPad to do it. The Camera Connection Kit allows for connecting a USB microphone and there are several good recording utilities. My brilliant

idea was to get a small USB hub for a few bucks, and use it to plug in
two microphones - one for me, one for the guest. Turns out, I'm not so brilliant. It doesn't work.
So.
I'm hoping I can get some recommendations... how can I do this fairly inexpensively but with good quality (
good quality, not studio quality, not "hey, you must be an audio engineer" quality

)?
Ideally? Under a hundred bucks, and I need a microphone or two (I have a couple of headsets, but I don't want to ask interviewees to wear one). I'll also be traveling with my MacBook Pro. A solution like the Edirol R-09HR would be great, but units like that tend to get pricey - right out of my price range.
A recording unit like the Edirol? Use the MacBook Pro with a couple of USB mics - or one mic set in the middle of the table? Something for the iPad maybe?