I've been rocking my handmade paper out newspaper and other types of "recyclable" papers, but I found that already recycled
paper (post-consumer) is the best for achieving durable yet flexible handmade paper.
Where to find this awesome material? Grocery stores.
One use for the material is creating small pallets for produce, like apples. It keeps the individual fruits/vegetables from bouncing around ontop or into one another during transport. Kind of like how an egg carton secures the eggs but isn't completely stiff and rigid.
Check more paper at my Etsy store: http://thickneckarts.etsy.com