I buy most of my hardwoods from M.L. Condon in White Plains, NY. They've got a great selection, a helpful staff and reasonable prices, at least for this area. You can spend all day looking through the stacks, and all they ask is that you leave them neat when you're done. They'll mill to your specs while you wait. My only problem with them is their hours; they are only open weekdays during normal business hours. Unfortunately, they don't have a web site.
I've reproduced their price list below. I didn't ask for permission to post this list, but I'm guessing they wouldn't mind.
Click to enlarge pages.