I dunno if they're US only (or if you're somewhere that it would even matter), but this is one place I've seen folks get heatsinks from. They have them in different widths, and cut them to the length you need.
May be cheaper than timber when you add in shipping. I believe the driver adds the most to shipping if you can find that nearby.
Kingbrite through Alibaba of course, may be the cheaper, they have various sized pin heatsinks drilled and tapped. 100mm or larger for 50w cxb3590/3070. And they have low priced to bin crees.
Mechatronix is what the cutter kits use, check their distributors for just heatsinks.
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