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Chris. You're unlikely to find a spare bubble chamber without paying through the nose and then some. However, there's plenty of advice on here about renovating one. Sharps are available by the dozen from China on eBay for pennies. Just make sure you do it over a tray because if you lose the tiny ball bearing you're really in trouble.  Unless you're pretty confident about your ability to seal the chamber 100pc vapour proof, use the least volatile possible liquid to fill it.  I used decorator's white spirit.  It's sacrilege I know, but you probably have it at home already, and your bubble stays a usable size for weeks if not months.  Have a go.  You can't make it any worse than it is already.  DaveP