The top ten of the most traded item are: Fire rune, Maple logs, Air rune, Spirit shards, Water rune, Feather, Nature rune, Vial, Blood Rune and Earth rune. If you want to take a closer look at the list visit runescape services with the most traded items list.
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The most expensive item in Runescape is a Christmas Cracker. I would say the price of one of these would be around 8-10b. Sorry for not an exact price but I don't know the exact figure :P
Currently, at over 2,000,000,000 coins, is the White Partyhat.
Just search for 'Runescape item ID database' and you'll find multiple services to search for item ID's.
There is no NPC, place, or item in RuneScape called "Kela."
Wiki Answers will not provide the information to break the rules of RuneScape.