The current Polkadot price is $5.23
Remember you don't have to buy a complete Polkadot coin it is possible to buy fractions of a coin to get you started on your cryptocurrency journey!
Coinbase is the world’s most popular way to buy, sell, and use bitcoin, ethereum, and litecoin.
Changelly is an instant digital currency exchange providing competitive crypto-to-crypto rates
A hardware wallet is a special type of polkadot wallet which stores the user's private keys in a secure hardware device offline and away from hackers.
There are many hardware wallets on the market, at bitsmart.io we recommend wallets from Ledger.