[cm3]

From the description on website, it appears to not bundle the computer, just the case and hdd. So, if we consider the HDD to be 60EURO max, having compared to other WD blue mobile disks (couldn't find the exact model listed anywhere), then that leaves you with 10EURO for the case. The total of 70EUROs may or may not include shipping, I couldn't figure that out without trying to place an order. It's not cheap, but that pricing isn't expensive either. If it includes a Pi 2, then it's cheap.

[tdkl]

The Nextcloud box consists of the following parts: 1 TB USB3 hard drive from WDLabs Nextcloud case with room for the drive and a compute board

It's worded weird, but I assumed the "compute board" is the PI.

[cm3]

Strictly speaking that doesn't say it includes one, just that there's room for one. But I hope you're right. I've looked at the PDF instructions and still wasn't any wiser.