SRAM PC1 chain, normally £13, now £6:
http://www.charliethebikemonger.com/sram-pc1-18-single-speed-chain-black...
I've been using KMC S1, but in this price bracket they're pretty similar. For regular polo players, 3 or 4 chains a year would not be unreasonable wear.
Really?
Use a drive train 'til it just doesn't work anymore. no point buying chains all the time if it still works? youre chainring and sprockets will wear faster, sure, but with the money saved on chains buy a new one.
I change my chain every week.
If you played more often, Andy...
Worn chains suck.
i think i have had the same chain for the last year at least