Local Bitcoin is a service where vendors sell Bitcoin and below is a link that has instructions on how to buy Bitcoin on this exchange.
When I was buying Bitcoin I looked at how much the vendor wanted and then added something like $50 to $100, depending on the price of what I was buying, to cover fees.
I used Pay Pal and then put the difference back into my bank account.
You will need to buy more Bitcoin than what the price of the product you are purchasing with Bitcoin in order to cover fees, small site commission and shipping and handling.
Pay Pal charges small fees too.
Please be sure to look at the reviews left for the vendor in question and make sure that they get good feedback, as close to 100% as possible.
localbitcoins.com
Here's a Bitcoin currency conversion calculator.
But, as I said, please look at the product you want to buy and all the fees associated with it and look at the fees your Bitcoin provider charges.
Also - important! - you will be expected to keep a minimum amount of Bitcoin in your wallet so you will need to figure that amount into how Bitcoin you buy as well.
You don't want to calculate your product purchase down to the penny only to realize that you've come up short.
www.coindesk.com