Send three first class stamps and a separate
self-addressed-stamped-envelope to:

Dillsburg Aeroplane Works
114 SAWMILL ROAD
DILLSBURG PA 17019

phone/fax 717-432-4589

Mon-Fri 8 am - 5 pm
Sat 8 am - 12 noon

Request a current catalog.

They sell a huge amount of tubing and are very competitive -
consistently below the vendors you mentioned. They also stock AN
hardware.

Fly right.

nc