Rail Europe: Young Travellers under 26 get 25% off FRANCE and SWISS passes
25% discount applies for purchases in May for travel in:
May/June/July for Swiss pass.
May/June for France Pass
This means you would have to already have plans and be going pretty darn close.
France Pass is $165: 2nd Class youth pass, 3 days in 1 month
Swiss Pass is $150: 2nd Class, 4 day pass