Where to find pre-plastered gauze.?

Okay so I'm going to help my cousing plaster her baby-belly.[She's pregnant].And i need to know where to find 4-inch widespread pre-plastered gauze.And sandpaper.

I also need to know what Gesso is,,and is it expensive?And if its not where can I buy it?
HELP!
thankss!:]

100 pts. best answer!
Answers:    And art supply store would have most of everything you have need of, and if you asked they would direct you to the products and how to do it - Home Depot or Lowe's or ACE Hardware have sand paper, and no Gesso isn't that expensive ($7-10/can).

Related Questions:
Should I enjoy articulate within what is served at my kid shower?   Do you buy or deal in kids clothes on e-bay?   Why did this develop...?   Not sure that this is typical?   Does it look resembling iv get bigger?  
  • Tell transmit signs of child molestation?
  • What are the possibilities that I.?
  • Would you procure rid of adjectives your footwear and travel barefoot for a free foot polish?