Advice on cheapest heatsink option.

Hey guys, trying to do a new build and with only 30 watts per CXB3070, what kind of passive or possibly active heatsinks could I use to be most affordable? I got a few in the same build
that will be 50-60watts but I'll use 140mm pinfin sinks. Ya know, the standard. But the mote I think about it the less I feel I should spend the money to use those same sized ones on a measly 30w.

Any suggestions/Links would be appreciated.
USA

muffin fan on top..better than everything

INF Flux used a baker's half sheet tray in one of his threads for a heat sink. They're made of relatively thick gauge aluminum, wrapped around a steel rod at the lip.

Heatsinkusa if you have the tools to drill and tap for own holes. Artic 11 alpine plus are good heatsink for 3070s also require drill and tap, up to 100w cooling. If you can drill and tap, heatsink usa 4.9" or 5.8" profile are great for passive

https://www.rollitup.org/t/heatsinks-for-diy-led-lamps.851907/
Great thread^^^ miss having supra around here for all the great diy info

I used aluminium strips on which mounted 6 old (AB bin) CXB3070's to create sort of a 90W Led Strip. In my case I mounted some CPU coolers on top for cooling (2 per strip), but you could probably just as easily use aluminium channels and go passive. Or mount two passive heat sinks on top of the strip.

In my case I had the same cooling requirements as 2 regular COBs per strip.

Ya I looked at heatsinkUSA I'm just curious, since I'm too lazy to do the math, if 6" of the 4.9 would be enough. I feel like I'd need to actively cool all of the LEDs, and that's gonna be 15 separate heatsinks....

theres a heatsink calculator thread with a java-based tool for the popular HSUSA profiles