The switch you can get at Digikey:
http://www.digikey.com/product-search/en?mpart=V7-1A17D8-048&vendor=480
I've bought my switches from here in the past. Besides slow shipping, I have no complaints
The relay you can try to get here, though I've never ordered from them
http://www.robotmarketplace.com/products/IFIW-SP1.html
I would suggest asking other teams. We have about a hundred (only a slight exaggeration), but I don't know if we could actually get them to you. I don't know what FIRST is like in Australia, but if there are any veteran teams, I would talk to them.