i want to buy just a 1 btc.
if only 1 bitcoin, you can buy it on a few big exchange, like LakeBTC, easily.
deposit funds, and buy bitcoin once funds to the account, withdraw the bitcoin.
this process is almostly free, deposit funds is free, withdraw BTC is free, only trading fee is 0.2% as a taker
buy bitcoin without verification here
https://www.lakebtc.com/deposits/new?currency=usd