You can obtain nice silks from Hobby Lobby, JoAnns, other craft stores, and sometimes even WalMart. Hobby Lobby's tend to be pricier than some of the others, but they're usually higher quality and more realistic looking with better colors. WalMart tends to have pretty decent silk ivy and "house plant" looking things. You can rinse them clean in warm water or spray with a mix of detergent and water and then rinse - what we do when we're cleaning old ones to use in new shows. (Costume design...) Some of the pet shops will have silk, but mostly they seem to carry the plastic plants - probably because they're easier to clean and more rigid.