Yes. Before buying it, check whether you fulfill the requirements (level 60 Attack).
There is no weapon stash in Runescape. If you need a sword or armor, you can either buy it at the Grand Exchange located at Varrok, or you can make your own.
varrock sword shop has got bronze,iron,steel,mithril and adamant daggers,but you can find any kind of them in the grand exchange.
in a really busy place ( e.g grand exchange) it happens but you can't see it on your own character
Runescape god swords are in fact for members but the closest weopan you can get to a god sword is the dragon 2h sword. the most expensive god sword is around 50 million gp.
No, it will be returned to you, you can collect it form a banker.
Saradomin Armour full set is exactly 4,000,000 coins currently. Saradomin sword is - 5,200,000 coins currently. these prices come from the grand exchange.
Saradomin sword or Dragon scimitar are popular.
Click on it... Duhhh
The current GE mid price is 1.3M and dropping.
Dragon 2h is cheaper, sara sword has same stats and speed as whip, but with an extra + 78 odd crush bonus, you choose.
Any as long as you have 60 Attack and have done the Lost City quest.
The Kalphite Queen drops a Dragon 2h Sword, along with Dragon Chainbody. But it is not advised that you even try to take her on. She is level 333 and has got multiple forms which you need to kill. Just try to buy it in the Grand Exchange, someone might sell it. Try world 2.