Where got shop that sell magic item in Singapore ?
What type of 'magic' are you speaking of?
If what you mean is "illusionist" magic or "street magic", there's a shop at Kovan Mall (Kovan MRT); there are at least a dozen "street magic" shops in Sg.
If you mean occultic magick including witchcraft, then there are several shops around Sg, but you might want to ask around for their locations in another more suitable forum.
If you're referring to scientific Atlantean technology, Google search "Atlantean inert pendants".