Purchase the Twisting Throttle books online from these places

NEW ZEALAND

Both books available from Mighty Ape. One book = $5.00 shipping. Order both books and shipping is free within NZ. 

AUSTRALIA

Both books available from Emporium Books AU$35.70 (TTAus) + AU$28.70 (TTAm)

UNITED KINGDOM

Book price from Amazon UK = £11.49.

USA

Both books available from Amazon