Some raws can be easy to get, while others can be quite hard (depending on their popularity). If possible, save yourself the trouble of browsing through countless websites/search engines/file sharing programs and just go to a store like the previous posters listed above and buy them in their original Japanese form (best quality prints, neat binding, portable anywhere). Other than that, I guess you just have to look around on the net, some BT sites might have them.
Then again... Winny works too...
