Please can anyone help - I'm a total camping novice, and have ordered a camping chef stove from millets, as I'm wanting to go away this weekend. However I rang them to check what gas canister i need to work the stove (I should say for my dh to work the stove!) and they said either a 907,904 or 901 but they don't stock them. She said they only go up to a 500 - and she couldn't tell me who might sell them!!!!!!!! Help - I've got a stove coming that I can't use, any ideas welcome, thanks.