If my memory serves me right, we only had tape and 5.25 disk. And tape was my main use. I later have seen a few carts, but no 3.5 disks.
Well, you're in Europe, I'm talking about Southern California. :p
I once found a box filled with 150-200 C64 3.5" disks. Most were home made, probably downloaded by whoever owned them; but a few were retail software, office-type stuff. I wish I could've brought it home with me.