They were fairly common in Europe (not in the UK, oddly). IIRC, they were manufactured along with a similar model, the C64G *after* the release of the C64C.
I'm not sure how big the German company Aldi was back then, but these days, it's a Europe-wide "stack-em-high, sell-em-cheap" supermarket which sells just about everything from pallets on the shop floor. By everything, I mean tinned-peas to PCs and leaf-blowers!
The C64C didn't sell in the same numbers as the breadbox C64 on its release in Germany, so Commodore re-launched the breadbox style case with a White keyboard and 3v 8580 SID chip.
I own a C64G but I don't know if there are differences between it and the Aldi model and I have to admit, I love the look and styling of these German White/Grey/Cream Breadboxes.