I need a new stem and seatpost. I've been looking around online stores and eBay, but the choices are so extensive that I have no idea which one(s) to pick.

Requirements:

stem - 26.0 clamp diameter, 80mm length, 1 1/8" steerer
seatpost - 27.2, zero setback

I'm a college student trying to save a buck, so economical suggestions would be preferable.