Any suggestions
I don't know about cheaper but stronger in Al. Here's just a couple of ideas off the top of my head, sure Google will throw up more :
GoldTec / BETD ?
http://www.mountainbikecomponents.co.uk/items.asp?CategoryID=32&Name=Goldtec+1%2F8th+Track+and+Single+Speed+Chainrings
Mattias Hellöre ? Builds prototype parts in Sweden and has a fine reputation.
http://hellore.se/experimentalprototype/
@Oswald started
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I don't know about cheaper but stronger in Al. Here's just a couple of ideas off the top of my head, sure Google will throw up more :
GoldTec / BETD ?
http://www.mountainbikecomponents.co.uk/items.asp?CategoryID=32&Name=Goldtec+1%2F8th+Track+and+Single+Speed+Chainrings
Mattias Hellöre ? Builds prototype parts in Sweden and has a fine reputation.
http://hellore.se/experimentalprototype/