Not that this will likely help much but I know of a heatsink company in Canada but I'm nearly positive they don't deal in such low quantities (ie- 1 heatsink) and if they do it's likely a bit pricey. The name of the company was R-Theta Thermal Solutions (they were bought out about a year back iirc). Their standard size is 6 foot lengths with many different profiles available but I don't know their cost on anything.
We used to order from R-theta where I used to work but we didn't deal in single unit orders and usually ordered 50+ heatsinks at a time. Might be worth a shot still and if you can find someone who wants the same profile as you, you can likely place an order and reduce the cost. If there's any interest I can try to contact the parts acquisition guy at my old job and see if he knows of anything else since I know they weren't the only company we dealt with.
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