Welcome to the Forum Trenton,
Regarding fiat exchange, Cardano currently doesn’t have it’s own platform.
Cardano can be purchased on quite number of exchanges now as quite a few of them have fiat/crypto onboarding, (although generally you have to buy BTC or ETH first, then swap for ADA)
Here’s a list of swap pairs Cardano price today, ADA to USD live price, marketcap and chart | CoinMarketCap
Good point regarding expansion and fiat, i think from memory that has been proposed previously (cash machine ATM style machines) and would be good idea to get that on the development agenda, might be worth checking out :-