I've been using "Lionroar brass pipes" (made for ship modelers, stretched instead of rolled) and they offered couple sizes below 1 mm O diameter (1/25 inch), but these things are 10 bucks per yard, very expansive. K&S tubes only go down to 1/16 inch, not thin enough.
Wondering if there're more affortable brass or copper options. I'm from Pennsylvania, but online retailer from anywhere would be ok.
Oh, and anything over 15cm (5 inches) long would do, I just need the diameter to be smaller than 1mm. Brass preferred for ease of soldering.