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If you can live with 53t planet x has cheap ones:
http://www.planetx.co.uk/i/q/CRSTRR/stronglight-road-9-10-speed-chainring
http://www.planetx.co.uk/i/q/CRSTRTT/stronglight-time-trial-9-10-speed-chainring
Yes, 9/10/11-speed chains all have the same roller width. Some Stronglight variants come in a choice of 9/10-speed and 10/11-speed, it's possible that the offset differs very slightly between the two but that would only be an issue if you indulge in extreme cross-chaining on a bike with very short chainstays.