You can get carving knives set from any stationery or arts and
crafts shop, even those neighbourhood shop.
You should state where you stay so that we can try to help more
productively.
Bras Basah is a sure bet.
If you are just trying to vandalise, any sharp objects will
work. Tell us where to appreciate the vandalism and remember to
sign off with your full name, NRIC and contact number in case we
are interested in commissioning you for more projects ;)