http://www.tf2outpost.com/search/38083612

Doesn't matter what people are asking for. Supply is monstrous while demand is nonexistant for this thing.

http://www.tf2outpost.com/trade/4728291

Guy got a fellow offering 1 key within a day (outpost has it filtered down to 1 week ago, but I was watching the trade out of curiosity on how the G Cannonball trades).

Putting up a key for a G Cannonball will get it in no time. Current price is fine.