Welcome Mercedes
Up until last year RealDoll/Abyss/Phoenix only allowed Paypal as an option for US transactions.
Since early last year I've ordered a number of bits and pieces (including a new face) from them and have had no problem paying by Paypal from the UK. As Phil suggested, contact their sales dept by email, then ask for a Paypal invoice to be sent to you.
Their contact form is available
here along with their phone numbers.
Good luck and please keep us informed how your purchase progresses.
CT