You can purchase a copy of Unravelling here, and pay via Paypal. You don't need to have a Paypal account. You can use any credit or debit card in the Paypal checkout. You'll see the total cost of your order, including shipping cost when you go to the checkout. Postage to the US is via airmail.
I'll send you an e-mail to confirm receipt of your order, and will aim to post to you same day.
If you're in the UK and would like to order from me direct, send me an e-mail to the address below, or find the Unravelling Page on Facebook and drop me a message.