Where can I get a plastic chain guard?

My chains are wearing fast as I commute 16 mile a day mostly down a dusty/muddy canal towpath. I'm looking for a way to keep them cleaner as, despite regular off-bike cleaning, I've got through a sproket and two chains in less than a year.
Anyone know if/where I can buy an after-market chain guard which would prevent all the censored through being thrown into the drive chain from the front wheel?
Thanks...
Anyone know if/where I can buy an after-market chain guard which would prevent all the censored through being thrown into the drive chain from the front wheel?
Thanks...
Kona Dew
Boardman Team Carbon
Boardman Team Carbon
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That sort of thing? They one that just covers the main chainrings too.
Anyone fitted something like this on a triple chainset?
Boardman Team Carbon