Where can you buy one-time forex futures contract? -

I am planning to attend university in Britain next year, but I currently get paid in USD. I want to take advantage of the low USD-GBP exchange rate to buy a one-time futures contract so that when I actually have my money in USD in 9 months, I can buy GBP at a guaranteed rate. I am planning to convert about $20k. Where would be the best place to buy this contract, any idea about how much it can cost (hundreds? thousands)? thanks. Hi there, Opening up an account with SaxoBank, It s a international bank. Use their trading platform on forex options. Long a PUT Options on GBP/USD for 9 months and the premium is 0.105 . 0.105 : 20,000 X 0.105 = $2100