When your cannon fully degrades and disappears all you have to do is go back to the dwarf that u bought it from, and if you bought it of another player or G.E. Then all you have to do is go back to the dwarf you started the quest at. ( I forgot where he is so don't ask me )
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Click Set-up cannon stand. Your RuneScape character will automatically set up the rest.
you can go to grand extange or to the place where you bought it orginally(the place with the dwarves)point is, you have to buy it back
no
If u r talking about a dwarf cannon, then yes around 550K-850K
Yes you can own as many cannons in runescape. But it will only let you set out one cannon only.