Having Free electircity does`nt mean anyhting unless you get full unless you get full profit from it .

You can put miners on mining if you have it or if you are unable to buy the miners just do some business with someone who invest in miners buy miners and give to you to mine. it will be good .

by the way in which country your are living in ?

i would go for spondoolies sp3x just because of shipping

if you are 100% you can sell the miners locally, you can go for less efficient miners, but take into the ROI equation the shipping cost

just my way of thinking