Limits are wither in the 100 or 1000's at a time, but can be random. If I were you I'd test it out.
They usually are sold on the Grand Exchange.
Yes.
Bone weapons can be easily bought from the Grand Exchange at a reasonable price.
No, it's only in the main Runescape the Grand Exchange was made.
Grand Exchange
The first Runescape player to say g.e. for grand exchange was WEEDYMUN.
Right click on the grand exchanger that's yellow, not blue, choose sets, right click on the mithril set and choose exchange
Grand exchange
grand exchange
Grand exchange
At the Grand Exchange.
the grand exchange on runescape