Yes, but it's the sort of rubbish 'sports' shop that only sells replica England kits and Nike Air Useless drinking shoes. For people who look at sport rather than participate.
Little monatomic jobbies will just weasel their way out through the rubber. That's why you don't fill your tyres with helium to save weight. Might be OK with argon, though.
For (black) butyl rubber tubes, this makes a difference. For latex (brown) tubes (the lightweight sort that leg-shavers use) it doesn't. Those things are so thin, permeable and downright leaky that you could pump them up with sulphur hexafluoride and they'd leak it out just as quick.
A better solution is to find over lycra-clad leg-shavers in the building and borrow their spare tube. I always used to keep one -- a perfect charm against ever needing it.
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