In reply to Stone Muppet:
Costs vary depending on whether the tours are guided or not.
For the training, for example Bruce Goodlad's 2-day avalanche course in Tignes costs £220 + Accommodation + lift passes + travel.
Chamonix off-piste courses: Ski Performance for Mountaineers £190 per person (4 half days)
Day with IFMGA Mountain Guide £65 (1 day)
Introduction to ski touring £270 per person (3 days)