Where do you get the tyres?
The tyres come from tyre shops and servo's, sometimes peoples back yards!
Do you have to pay for them?
The tyres are free and the tyre places actually have to pay anywhere from $1 to $5 for disposal of each tyre so they are generally more than happy to part with them!
Who knows, one day maybe they will be a marketable building material and there will be a price tag.
Do you get them delivered, how do you get them?
I pick the tyres up from my suppliers rather than getting them dropped off, one major advantage with picking them up is that I can be choosy about the specific sizes I require for a particular stage of the project and I don't end up with dozens of sizes I can't use and subsequently have to dispose of.
That's it for my tips on tyre gathering... happy harvesting!