The last couple lots of those I have seen went for close to $2/sleeve shipped. Goat store sells for $1/sleeve + shipping, but they are dirty sleeves that you need to clean.
It's probably cheaper to find a lot with a bunch of cheap games and go that route unless there are other places to get real sleeves.
I've purchased real sleeves myself, but they have always been dirty (retr0bright works great) and some come torn or written on.
There may be other suppliers of official sleeves, I haven't seen them though.