Price checks aren't allowed here. r/homelabsales does them, otherwise looking at ebay and filtering for sold listings works well. Good luck!
It doesn't get much cheaper than these:
You might find cheaper on ebay if you wait, but I'm impatient so these worked for me.
Surprisingly quiet. Not offensive to have it in the same room as you after boot. With IPMI fan control you can get it to very reasonable levels. I had one in my office for a while. Of course as with all sound questions YMMV.
Assuming the unknown card is the first picture it's an AOC-SIMLC which provides IPMI as on the X7 generation they had add in cards for the feature.
It looks like the right rack ear is missing and the left one is significantly damaged correct?
I happened to have some cooler master fans on hand. They're just case fans that I connected up with a power brick that has 4 pin molex output. Played around with a few models I hand on hand to find the right balance of noise and airflow.
If you have other items you'd like to buy from supermicro consider using their store for the I/O shields as they're only $2.70. For just one item the shipping makes it more, but if you need more than one or have other things that would already cost you shipping from supermicro it'll save you a...
www.supermicro.com - /wftp/driver/SAS/LSI/3008/Firmware/
The included guide should work fine.
Edit: Newer firmware on the Broadcom site. Instructions are in the package there as well.
SAS 9300-8i Host Bus Adapter