Here 'down under' we are in the middle of the school year so the tips will have to be kept for January. LOL
Just a point here - so many of these tips seem to refer to clothing. In Australia, New Zealand, Great Britain and I know other countries the school children wear uniforms. This is so much easier for everyone - the mums when shopping, the dads when dressing the children (as per one hint today), and especially the children as they know what to wear each day and there is no peer pressure to wear a particular type of clothing.
This page contains the following solutions.
Our kids go to a private school. At least 3 times a year, the school hosts a used uniform sale. It can take some digging but we always find items that still have life in them.
One thing you could do to get uniforms, jackets and such is to put a post up on Freecycle or a Yahoo group. We have one here in Jefferson Parish, which is like a county. Maybe you can check to see if you have one in your town or area.