all my props are usually cardboard covered in mud roc. A staff I made for a Tsubasa cosplay has a wodden rod I got a B&Q for a couple of quid.
depending on what you're making you can usually find something to go with it. a lot of the time I find the trick is looking for things which would have the same look once they're painted or covered in something.
for example for camera lenses on a head of Briareos (appleseed) I ended up using the bottom of a 7up can and bottle tops.
London MCM Expo May 2013
London MCM Expo October 2013
Current Project: Fai & Kurogane from Tsubasa
Past outfits: Neku (TWEWY), Grell (Kuroshitsuji), Matt (Digimon), Miyavi, Aoi (the GazettE)
Dream outfit: Zato1 or Testament from Guilty Gear