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where can we buy this ?

You can get Tronix on Binance https://goo.gl/NCivJk
Or any other exchange that trades it list @ https://coinmarketcap.com/currencies/tron/#markets

No need to disclaim that your are not a financial advisor when your buy for TRX is 3-6c when it is trading at 5.2c.

More importantly, though, could you provide just a tiny but of reasoning as to why you think it will hit $2 in 2018?

For your sake, I would love for you to be right but with 100 billion tokens in circulation, Tron would be worth $200 billion if the price hit $2. Note: Current total market cap of crypto is $495 billion.

So I guess my question is really - why the heck is Tron worth $200 billion?

Yeah I don't see where this $2 number is coming from either. Even optimistic estimates have it closing the year around $0.50 - $0.60.

https://uslifed.com/price-prediction/tron-coin-price-prediction