cheapish used Setrab coolers
 

Cheap miata bros, I stumbled across Yates website which flips used components on the cheap, including a lot of Setrab oil coolers.

No affiliation, just noticed nice coolers for <$80.

Used Racing Cooling Components | RoushYatesParts.com

-Zach

I'd have one ultrasonic cleaned before I threw it on any engine I cared about. Good prices though.

Roush has them by the dozens, as does Circle Track Warehouse (both a few miles apart from one another). Agreed though, get them cleaned. Same for just about any filters that come out of there.