there are too many crypto exchanger all over the world you can choose for buying of bitcoin like for example binance, coinbene,kraken,choose the low price. You can check in localbitcoin they are low price from other exchanger.
If you going to buy bitcoin you can go to the crypto exchanger where you can buy all kind of cryptocurrency especially bitcoin. You can also buy bitcoin through using wallet like coinbase where you can use your credit card to buy bitcoin. Its up to you what exchanger you want to use but always check the website before you buy.