Hello crypto enthusiasts and especially the newbies here. You might see some good new mining hardware being already sold out and the only option you will see is to buy at a premium from eBay or Amazon.
I will strongly suggest against this.
As an example, the new D3 Dashminer has a crazy 15GH/s hashrate and you will see that the initial $1600 investment will be earned back in merely 27 days with currently difficulty. That's a great ROI, and you might think that even paying double the price is worth it, however that is where the real problem is.
There were 100s of these sold in different 15 day apart pre-orders from Sept to Dec. and so the difficulty rise will be so steep that the ROI will start looking 200 days and more in no time.
So you will never see your money back unless the coin itself shoots up way high (where buying makes more sense than mining). Also with all the stress associated with mining, such as rig not working, burnt, damaged for whatever reason etc makes mining at a huge premium a bad decision.
Take it from me, as I did this myself and burnt badly, where I bought the butterfly labs 64GH/s miners for 3K each off of eBay and never got the returns back in 2013. And also lost every single bitcoin to MtGox that I got from this mining activity.
All in all, I spent 6K USD for miners which I ended up selling for 170 USD each on eBay after 6 months of mining. Plus huge electricity bill for 6 months of mining (around $150 USD each month).
So please think twice before pulling the trigger. I am not discouraging you all, however offering some first hand experience so that you all can make an informed decision.
Thanks!