Below are some of the vendors of robotic hardware, software, and related materials:
(US): personal electonics & robotics specialist
(UK): personal electonics & robotics specialist
(Canada. US): robotics specialist
(Porirua, NZ): supplier of nuts, bolts, all manner of stainless coolness
: whereas Bunnings have rather meagre pickings, Mitre 10 carry a pretty good line of stainless nuts and bolts
: miscellaneous everything, including wheels, hardware, etc.
: an Auckland supplier of pretty much any plastic you might need. I used clear polycarbonate and black delrin, ordered on the phone and it was here in a few days.
in Petone. They don't sell some of the more unusual plastics like Delrin but if you just need perspex (acrylic) they've got it and they're nearby.