I had the option of buying either 1 huge block or the individual blocks in the tin foil and plastic (both by Hikari). I like the individual blocks better too. That's how I buy the frozen brine shrimp as well.
There was another brand (I forgot to check the name), the girl at Petsmart said she doesn't like it as much because when she uses them they seem dirty.
I haven't tried smelling them yet...
When I break my pieces, I put 1-2 blocks into a small plastic sandwich bag, set the bag on my counter top, then use the bottom of a glass to gently crush them. It works well. You could probably use the corner of a glass to break off a chunk of yours.