These hollow stainless steel needles (each size sold in sets of 4) are purchased from an outside vendor. Each set of 9.5" and 13.5" stainless steel double-pointed needles comes with four needles per set.
I measured the sizes with a pair of digital calipers. They are not exactly the same as the US sizes, but they are VERY close. I've matched the sizes I have below with a standard US sizing chart so you can figure out what you need for your project:
US000 - 1.50mm (a standard US000 is 1.5 mm) 9.5" - $ .50; 14" - $ 2
US00 - 1.70mm (a standard US00 is 1.75 mm) 9.5" - $ .50; 14" - $ 2
US0 - 1.95mm (a standard US0 is 2 mm) 9.5" - $ 3; 14" - $ 4
US1 - 2.16mm (a standard US1 is 2.25 mm) 9.5" - $ 6; 14" - $ 8
US1.5 - 2.56mm (a standard US1.5 is 2.5 mm) 9.5" - $ 1; 14" - $ 2
US2 - 2.75mm (a standard US2 is 2.75 mm) 9.5" - $ 6; 14" - $ 8
US2.5 - 3.16mm (a standard US2.5 is 3.0 mm) 9.5" - $ 2; 14" - $ 3
US3 - 3.35mm (a standard US3 is 3.25 mm) out of stock
US4 - 3.45mm (a standard US4 is 3.5 mm) 9.5" - $ 8; 14" - $ 10
US5 - 3.84mm (a standard US5 is 3.75 mm) 9.5" - $ 8; 14" - out of stock
US6 - 4.00mm (a standard US6 is 4.0 mm) 9.5" - $ 8; 14" - $ 10
US6.5 - 4.31mm (a standard US6 is 4.0 mm) 9.5" - $ 4; 14" - $ 6
US7.5 - 4.70mm (a standard US7 is 4.50 mm) 9.5" - $ 4; 14" - $ 6
Bear in mind that these stainless steel needles are hollow. I've been using the same set for years, and although I'm a rough knitter and bend them slightly, I have never broken a needle.
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There are separate listings for the aluminum, plastic and bamboo DPNs!
I'm willing to ship outside of the US but will need to get your mailing address so I can calculate postage.
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** Please be aware** Goods may be subject to customs charges and fees; these depend on the contents’ value, and the recipient (buyer) will need to pay these before the parcel is released. The customs authorities in the destination country determine if charges are due on imported goods. The levels and thresholds of charges vary from country to country. Please contact the embassy or customs authority of the destination country for help. Informaion c/o http://royalmail.com/customs but applies to all non-US purchases.