In reply to johnboybuchan:
Would certainly second flying - recently booked return flights to Geneva from Manchester, with one and a half 20 kilo duffles (flying with a mate and split the cost of 3rd bag) for £112, transfers from about £25 each way.
Stay in the Argentière campsite (approx 5 euro pppn with 2.50 a night for the pitch), and they give you a pass for free bus and train transport within the valley, the train will get you to the Midi in time for second lift. Campsite is super nice with wifi if that's a concern to you.
Last year we got a 7 lift days in a 10 day span pass, was 100 euro.