Where are you located?
How fast does that thing mine ethereum?
Do you have any older AMD GPU's laying around as well?
I have 4 s5's that i would consider parting with, but i am not certain they are all up to your standards.
One works great, not a thing wrong with it. 0.0001% HW @ 350 clock speed 0.0068% HW @ 387.5 clock speed
The other 3 are less than perfect, i bought them pre-abused from a "reputable vendor"
They have their odd quirks, but hash close to where they are supposed to.
I have them underclocked @ the moment, 2 are running on a cheap 900 watt PSU pulling 807 watts @ the wall @ 250 clock speed
3rd one is running on a little EVGA W1 500 watt psu pulling 405 watts @ the wall @ 256.25 clock speed
I'm sure it would be a bit less with a better psu that wasn't close to being maxed out.
1st has 2 xx's or is missing 2 chips upon startup ( coin toss) 0.0158% HW
2nd does same as above, sometimes shows all asics @ startup and has huge HW errors untill the 2xx's show up,(almost a minute) then no hardware errors
3rd has a chain that is missing upon powering up, but a reboot brings it back 0.0182% HW