At the time of this writing - June 20, 2012 - it seems to be the Bandos Godsword, at 3.9 million. However, prices do change, so this may change.
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.
Gwd
well i think your talking bout runescape if not youll have to wait longer. i know how to make a god sword but not saradomin. to make a god sword find a god sword blade or the 3 god sword fragments and a handle for the godsword go to an anvil use one of the fragements on anvil till you have a blade. then use the handle on the blade. you have a god sword! but you need lvl 80 smithing
Longsword.
Obtained as a drop from Commander Zilyana in the Saradomin Encampment of the God Wars Dungeon.
armadyl god sword for two handed weapons and abyssal whip for a single handed weapon
Monsters in the god wars dungeon drop them. They're really hard to beat though.
You can make a Blurite Sword in RuneScape as long as you are completing the quest The Knight's Sword. After you complete the quest you cannot obtain the sword again as you cannot trade the item with other players.
vestas sword, but the best weapon is chaotic maul.
Probably WOW, but Runescape will always work out the cheapest.
Killing bosses at Godwars Dungeon they drop parts of the blades, of which if you have a good smithing level, you can combine to makes a full godsword.
well if you want a balance between cheapness and goodness (excuse my poor grammer) then adamant armour is good.(the cheapest is bronze and the most expensave in one fo the god armours i think.)