Origami

Folded Square
Supplier of a range of Origami-based products available worldwide.
http://www.foldedsquare.com/

Japanese Paper and Origami Supplies
Offers a wide selection of paper and books plus Japanese washi and yuzen paper.
http://www.origami.com.au/

Kim's Crane
Supplier of books and papers from around the world.
http://www.kimscrane.com/

Origami Papers UK
A catalogue of papers from single plain colour to handmade washi. Also has a brief explanation about origami origin and uses.
http://www.origamipapers.co.uk/

Origamido
Offers a range of design, production, and instructional services and products for origami and the paper arts.
http://www.origamido.com/

Paper Jade
Offer handmade and regular origami paper from Japan.
http://www.paperjade.com/