I need to repair a three inch hole in the drywall at my place but Im not sure where to pick up plaster to do it. Are there any stores around city center that sell it? Also not sure how to saw that object in chinese so Im not sure how to ask store owners whether or not they have it.

Hi man, it's a trifle but quite annoying. Plaster—腻子粉 or 双飞粉 Here are the options:
1. check out your neighborhood for deco-store
2.search it online taboo.com

3. use your imagination to doodle it
4. just let this 3 inches be :o

good luck

get some chicken wire, cover hole plaster over and sand it down.