In reply to sethmford:
Flying is cheap but consider that transfers cost £50, and you are limited on baggage. the cheapest method i've found is the eurolines bus for about £100 return.
As for climbs there are thousands, intermediate is a little ambiguous. It depends on what kind of thing you want to do; rock, ice, mixed.. etc.
Other than that some tips i can think of:
Get a lift pass, don't be stingy. I've walked in to the Argentiere hut from the valley and after that I bought a lift pass and never looked bag
Go to midnight express and Bar d' up at least once!
Try to use free bivi huts, or plan routes around them if you're short on cash (Kuffner arete is a good exmple)
Dont waste time in the valley umming and aahing, try to get out climbing or doing something every day, just be clever and plan around weather forecasts, be prepared to travel.
Stay at Bernards campsite !
Visit the guides office for route beta and get an enlarged copy of a topo if your route is intricate!
Grill the guides on the conville and get as much info as possible.
Acclimatise!
HTH. Pete.