Yep got some from the chemist this morning, 35c each, better than $15 off ebay ! They are sized in diameter by 'gauge', the following rough comparison (found two charts that conflicted slightly so I went down the middle) to millimeters.
The size of the needle that comes in the Racetech tool is 22 gauge (.65) but my chemist only had 25 gauge (.46), It might bend easier but I am happy as the .65 let too much gas out on removal, the smaller needle might not let out as much?
30 gauge = .255
25 gauge = .455
22 gauge = .644
20 gauge = .812
18 gauge = 1.024
7 gauge = 3.664