I just bought a 50' roll of DB link 0ga for 85 bucks shipped off amazon and its awesome. Very high quality, large strand count. Not some cheap stuff with a ton of insulation and I had to cut just a little bit off for it to fit in 0ga fitting or the amp
I have a 23ft and 27ft run of KNU klmx used both runs black all ends with ring terminals and also each run has a piece of steel conduit 6ft long to protect the wire in the engine bay. lmk if interested since its split but its 50ft total or a tad bit longer