There is an interesting offer of a 2017/2018 season pass "Magic Pass" for 359 CHF.
It is valid at 25 Swiss ski stations, including Grimentz-Zinal.
It is currently possible to order it until April 23, 2017 at https://www.magicpass.ch/
Before ordering, check the Zinal-Grimentz tariffs and discounts for other options such as low season discounts and discounts for ordering online in advance.
Season pass for 359 CHF till April 2017
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