As others have mentioned, apparently the distribution of Fuji Quickloads is being discontinued in the States, maybe everywhere outside of Japan. No one seems able to find any link to an official notice from Fuji, stating that Quickload production is indeed history, yet.
The story on Kodak Readyloads seems fairly consistent. They are, or have been history for about three years now. Many posters to forums have stated that Kodak's Readyloads, were actually sleeved under a contract with Polaroid. Polaroid had the machinery and the clean room to sleeve the film, at a lower cost then Kodak thought they could. With the demise of Polaroid in 2008, so went the Readyloads.
The Impossible Project is trying to get something in 8X10 instant film, up and running, possibly before the end of this year or early 2012. Absolutely no hint at all, of any attempts by Impossible to produce single sheet, 4X5 instant film.