In reply to pasbury:
After many years organising ski trips as cheaply as possible, I've come to the conclusion that skiing is never a 'budget' sport if you use lifts. You can definitely minimise costs by following the advice above, but lift passes are an unavoidable expense and generally end up being 30-50% of our total costs.
Picking a smaller resort helps reduce costs (we like Bernex, France where an adult pass is about 23 euros/day), and if you're only skiing for 2 or 3 days there should be enough pistes to keep you entertained.