also where can i buy them?

I think it will be tough to find those, but try the discount stores.  I found a bunch of those at a Big Lots a few years ago.  Stores like that, or Dollar Tree, Grocery Outlet, etc often have those "less-than-popular-series" but usually only ones that retailed the previous calendar year. 

On a side-note, I had fun collecting the old Crack-Ups.  Since they're designed to be crashed & smashed, it was very satisfying to find them in good condition - and total grail to find them carded!