| About £10 for a reasonable, basic 9 speed. The best all round chain is SRAM. These are a little more expensive, but worth it. You could always go the full hog and pay £200 for a titanium jobbie.
PS How long has the chain been on the bike in that condition? You might want to look at changing your rear casset/gear. This is because, as the chain stretches, it wears away the teath of your sprokets. Extreme versions can see a hook shape worn into the teath. When you replace the chain, but not the sproket, the new chain will wear quicker, as it is stretched into the old wear pattern.
PPS Oil the thing.
Luck
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