Information on Roman Lower Classes

Ok, I'm working on a fantasy that has a technological level of about early Roman Empire, and deals with characters in the lower classes (day laborers, migrant workers, escaped slaves and such).

While I have resources detailing everyday ancient Roman life for middle and upper classes, I have found information on lower classes to be difficult to find. I assume this is because people find it less interesting, coupled with the fact that there is probably less archeological evidence.

So anyway, I am looking for books, websites, etc. that could detail what life would be like for these people. What were their tools, clothes, food, houses, and overall lifestyles? Also, how would they travel from one place to another (my characters will become refugees of war, and they need to travel) and what would they take with them? I'm not only interested in big city life (slums included), but life in smaller cities and towns as well.

Of course, an expert replying would be much appreciated, but I'm asking for such a broad spectrum of information that I think research sources would be more helpful, then if I have specific questions I can always come back!

Thanks for the reply. I'm familiar with the patron system; in fact, much of the conflict in my story comes from the "refugee" status of my MC taking away any patronage (and therefore, work) he had in his previous home.

I'm more focusing on physical details, such as what the houses, tools, and foods were like for the lower classes.

Like I said, it's a fantasy, so I'm not going after historical accuracy quite so much as technological levels and basic living arrangements.

The broadness of my questions is really better suited to sources (so that I can sift through all the info myself) than replies relating to one question, but these are much appreciated.

Ariella, that sounds just about perfect. Thanks.

Anyone else know of anything?

Thanks everyone!