Just keep trollin through the FS/FT pages on here and [H] man -- I see that sorta stuff come up every once in a while. Gonna take some effort but I am sure you can find some, although they will probably be a bit spendy.
I do see people selling cards with full cover blocks quite often, it might be better off to sell your cards and then get a new(er) set of cards that someone already put blocks on -- you are pretty much guaranteed to get a better deal doing it that way.