Been around a for a while now, normally available from Lidl (so in view of the fact that it's officially sold here I'm not sure if this is the right category...)
Packaged as a bar, but in fact individual squares against a card backing. Available in lots of flavours and very nice. Not unlike the Ritter Sport range.
You may also see this in Aldi; identical except that it's branded as 'Mauxion' instead of 'Trumpf'.