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
Step 1: Gather your tools.
You will only need the mold/deckle, a household sponge, one "apple pallet", a mixing spatula, and a blender.
The mold/deckle can be created using old picture frames or even just scrap wood you have lying around. To create my deckle, I used a screenprinting frame by removing the silkscreen and replacing it with a nylon-type mesh used for screen-windows. The mesh is relatively cheap and durable. For the mold, I used an old picture frame.
Any household sponge will work.
Any grocery store should have some of these "produce pallet/carton" things lying around somewhere. To save gas and time, you may want to call ahead.
If you cook/bake, you probably already have a mixing spatula in a drawer somewhere. But a word to the wise, once you use it for paper-making, buy a new one for cooking.
As for the blender, once you use it for paper-making it's not a good idea to use it for making anything else. So if you use your blender a lot for cooking, juicing, or whatever, maybe purchasing another one at a thrift store or a yard sale would be good.