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What's reasonably priced to you? 104 bcd?
Superstar do Silver, might need to hunt around for 40T, looks like 38T is their max unless you're after a 110bcd version. Oh wait, 5-bolt? Err..
http://www.superstarcomponents.com/en/i-o-chainring-narrow-wide-style.htmStronglight do 5-bolt, 110bcd, silver, 40T:
http://www.ebay.com/itm/Stronglight-5-Arm-110mm-Alloy-Silver-Chainring-RD110-/120576056736Sonic Cycles do Gebhardt which have silver, 40T:
https://www.soniccycles.co.uk/products.php?id=100&cat=2
Silver, 5 arm, 40t, narrow wide chainring, reasonably priced. Does such a thing exist? I have googled. Is oven-cleaner my only option?