Possible to have a multi-priced item?

Hello,

I'm building a shopping cart for a non-profit organization. They want people to be able to sign-up for Conferences through their site.

A single conference will have a 3-level pricing structure:
1) Early Bird Price (reduced price before a certain date)
2) Members Price
3) Non-Members Price

Is the e-Commerce module capable of something like this? If so, how would I set this up?

Thank you.

Brady