I got my s9 from the site below.
Add a power supply.
Get one of the 140mm fan options, quieter. Runs Braiins firmware because it gives you more control over output, 100w to 500w per hash board.
Make sure to spread them around breaker wise and stay under your total panel limit.
You will get 5x the sats per watt of electric input from an s19 than a s9 even though they output the same BTU per watt of input. I strongly prefer s19s with a single hash board (600w minimum output for a single hashboard enabled in braiins) unless the higher minimum wattage is too much heat for your space.
https://d-central.tech/product/bitmain-antminer-s9/