Cans of air

Where can you buy cans of air? I live in the UK BTW. I just can't seem to find any, other than ebay but it's £3 shipping. How expensive are they? Thanks

you mean to tell me we havn't invaded you guys with walmarts yet?machiavell8x8

I got a can from Maplins in-store, cost about 6 quid.machine_B

Ok thanks, but if you ask me it's a lot to pay for a can of air. :P