even with 0.04$ power rates I wouldnt buy these miners at that Price.. its too expensive for it to make ROI anytime soon.
Best bet would be to drop the Price and hope for a local pickup.
a little math that everyone can make:
## used S3 (delivered in a week)
power bill = 420$/month
20TH * 0.008 = 4.8BTC = 1150$
profit = 730$
if sold for 19BTC = 4560$ / 730$ ~ 6.23 months for ROI at current diff, so probably around 8months total
## new ANTMINER S7 BATCH 2 (delivery end of month)
20TH = 4 devices = 6400$
power bill = 140$/month
20TH * 0.008 = 4.8BTC = 1150$
profit = 1010$
6400$ / 1010$ ~ 6.33 months for ROI at current diff, so probably around 8months total
I don't charge your opinion, you are correct, but i don't pay electricity so for me the math is little different.
Peace,