I've just unpacked my favorite sock needles -- Brittany 5" Double Points in sizes US 1, 1.5, 2, and 2.5.
The half sizes are the hardest to find and my favorite. Ever had a 1 be too tight, but a 2 be too loose? That's where the 1.5 is perfect.
Also in stock today are more 40" US #2 Express needles for Magic Looping socks. At $6.50, they're easier on the budget than Addi's to have multiple projects going at a time.