What platform can I buy Siacoin?
Siacoins are available on a number of major exchanges like Binance, Bittrex, Kraken, Upbit, Poloniex, Huobi, OKex, and HitBTC. Get the full list here. Some exchanges support direct fiat (local currency) to Siacoin purchases, but others require you to buy Bitcoins, Ethereum, or other crypto to make your purchase.
Where can I buy Fiat Siacoin?
Coinbase is the primary place online to purchase Bitcoin with USD and other fiat currency. You'll need to sign up for an account before you can use Coinbase.