http://www.brooke-kensington.co.uk/
Edit, here are more:
http://www.rockauto.com/
http://www.komo-tec.net/catalog/index.php?language=en&osCsid=a3a1e652e98a2e59b3a279c1e9f41773
http://monkeywrenchracing.com/lotus_elise.html
Link to links about parts:
http://www.pistonheads.com/lotus/links.asp?page=LotusParts&top=lotus&
Edit, One more, sorry is in Italian:
http://www.pbracing.it/
Edit, here are more:
http://www.rockauto.com/
http://www.komo-tec.net/catalog/index.php?language=en&osCsid=a3a1e652e98a2e59b3a279c1e9f41773
http://monkeywrenchracing.com/lotus_elise.html
Link to links about parts:
http://www.pistonheads.com/lotus/links.asp?page=LotusParts&top=lotus&
Edit, One more, sorry is in Italian:
http://www.pbracing.it/