I emailed Woolsworks Ltd. who sells those nifty double point needle holders to inquire about the price. The response was:
These holders are reproductions of those used in the
19th Century and are crafted using time honored period techniques. Each one
is made individually by a tinsmith, no machinery is used. I have 2 sizes
available. The small holds shorter dpn's 5-71/4 inches for 15.50 and the
long holds 8 inch needles for 17.50.Shipping is $2.00.
They do accept credit cards and Paypal.