scatrina.com
xpee.com
thisvid.com
motherless.com
eroprofile.com
heavy-r.com
hotgoo.com
tumblr.com (just go to tumblr.com/search/scat if you don't have a profile - explore a bit)
Tubesites include scatville.com, nudevista.com and many more (most of them are junk).
Of course, there are plenty of sites with piss and such, but the ones above are the best free sites with original scat content every day or so.