As a magician I spend a lot of time ordering things on the Internet and going into the few remaining "bricks and mortar" magic shops dotted around the UK. However the next most useful source of magical items is your average stationery shop - like W.H.Smiths! You can find all sorts of useful things in there that will help you to "design miracles". I can't reveal any specifics but a quick look round should give you some interesting ideas, especially in the section for adhesives and pens! Let your imagination run wild!
P.S. Not sure when to use "stationARy" and "stationERy"? Try this reminder - "the cAR is stationARy" and "the papER is stationERy". It works for me!