Someone wants to sell me 12 pieces of P106-100 for 200$ each and I find this to be tempting because that card can achieve 23MH on ETH, two of those is 46MH for 400$ and I'm running solar panels, maybe I should just wait? I also remember that a 1060 GPU costs 120$ in 2019, will you wait or take this offer?
So let's assume you bought it at 200 these 12 cards which can make you like 270-280 Mhsh in total in average.That would be an average of 10 USD daily based on actual difficulty in Ethereum.Sounds like 300 USD a month net without any further spending is a good choice at least for me it is.I would also suggest that if you buy in bulk tell that someone that I can pay max 150 USD for a card and that way your ROI would only be 7 months which for me makes it ideal.
If you buy at 200 then the ROI would be 8-9 months,still a good buy in these difficult times but not as good as if you pay 150 USD for a card.