What do 750's of Cantillon normally go for?
reddit: Cantillon Prices at Brewery (from 4 months ago)
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this image, to-go 750's were €7.50 for standard geuze, and up to €15 for fruited/dry-hopped (mind you, the two on offer weren't their top-notch exclusives like lou pepe or foufoune). i'd expect prices at a retail reseller, in another country, to be higher... but still, hopefully €26 was for a non-standard.
paying €70 for a suitcase full of 'loons would have been economical, had you planned for it - but probably impossible to pull off on the spur of the moment the night you're leaving euroland. paying €70 to bring home 2 bottles wouldn't make sense.