there are a lot of digital dictaphones available now, but most are pricey.
the sound is pretty good, and I'm sure that there are even mic jacks if you wanted something even better.
I didn't have much time to look but
this was about the least expensive (of the higher quality kinds). I'm sure if you searched around you could find something cheaper.
[edit: clicking at the top of that page gave even more choices of inexpensive recorders]
<---- click the smilie. DO IT.