Forex Futures Contracts

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
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