We recommend that you point your apt sources at our mirror's apt-proxy. This way you get all the latest updates without costing you any IPQ! Here's a sample configuration for your /etc/apt/sources.list file. Note that you may replace (or replicate) stable with testing or unstable if you are running those Debian releases.
# /etc/apt/sources.list for Debian stable using CSE's apt-proxy
deb http://mirror.cse.unsw.edu.au:9999/debian stable main contrib non-free
deb http://mirror.cse.unsw.edu.au:9999/debian-non-US stable/non-US main contrib non-free
deb-src http://mirror.cse.unsw.edu.au:9999/debian stable main contrib non-free
deb-src http://mirror.cse.unsw.edu.au:9999/debian-non-US stable/non-US main contrib non-free
deb http://mirror.cse.unsw.edu.au:9999/debian-security stable/updates main contrib non-free
You can download this file from http://www.cse.unsw.edu.au/~csg/apt/debian/sources.list