I picked up a COB from Amazon a while back. It was one of the "Galaxy Hydro" lights. They have released a number of COB setups but most were not using any reputable chips. I picked up their 2018 Edition which came with 2x CREE CXA3070. Not quite as good as the CXB3590, but I've been impressed by what this little 110W draw light was able to achieve. I run it in an 80x80 tent.
I don't know if you guys know of the autocobs, the dude has a huge following in the autoflower community in the US, since he's quite active over on autoflower.net - but he ships to S.A and the lights are of great quality. The chips are Citizen CLU 48.