https://www.frost.co.uk/motor-parts-...isher-8kg.html

I got mine when they were still £99. Not the most robust of machines, but does the job, and was the cheapest tumbler I could find that would handle reasonably sized parts, without spending 4 figures on an industrial machine.
The media is very expensive from Frost though. The last batch I got was from Moleroda (https://www.moleroda.com/product-cat...and-compounds/), but have a search.