郵送のほうが安く済む

はずです。
It is possible to buy certain Eurail passes at train stations in Europe.
You can also buy your Eurail passes with Eurail.com with delivery to your home
or work address. We also deliver to Europe, including to hotels and hostels.
Why order online from us

Here's why we recommend ordering with us:
Save an average of 20% on the price of buying your passes in Europe.
必ずあるという保証もないので、郵送が一番安心できると思うのですが。