Amazon has Montroll's "...Mythical... " for ~$50 still steep, but cheaper than $100. You may find is cheaper in other countries.
Amazon, Barnes and Nobles, sasugabooks, Amazon.jp and other countries are good sites for books. Also, check ebay.
Also, if you are convenient to Chicago, check out the main library. Ask for available Origami books, books by interlibrary loan (which may include local universities), as well as suggestions for used book stores online.
In addition, I bet that Chicago has millions of art supply stores, and at least one will have some interesting paper. There may even be a little Japan, or some Japanese stores with Origami supplies.
You can check out http://www.origami-usa.org/, check under shopping for KAMIYA. Also, there may be books and paper for at the convention.
And, check out http://www.britishorigami.info/ under supplies for their books.
As far as doing Origami without reading the language, that depends on your skill. I can't fold his stuff easily, even when written in English and accompanied by videos

- Hank Simon