Kevin
Go digital! There not too expesive and great for promoting your work. I point my potential clients for sod,barrier and irrigation jobs that have internet access to my storage site. Also as Eric mentioned, you can take multiple pictures of the same thing and pick the best one. Also by going digital, you can edit your pictures or correct mistakes and add text.

There are a few places that offer free picture hosting such as photopoint.com. Both myself and Kirby use this site. Click on my link(Some of my work) at the end of my sig.
The camera that I am using is a Kodak model DC240. I got it for $209 at ubid.com. Just have to be careful not to overbid the value of the camera. They said the value was $499, but it was a refurbished camera. I've seen CompUsa and Best Buys selling this refurbished camera for over $400 Still for 209, I don't think I got a bad deal. I'm very happy.
Get at least 1.3 mega pixal, if you want good quality pics.
John