well its a month later , but i finally ordered my additional tubing today to make a vector 
i ordered .....
DXE-AT1488 Aluminum Tubing 6' x 1.500" x 0.058" wall, 6063-T832 drawn, no slits $8.95
DXE-AT1495 Aluminum Tubing 3' x 0.625" x 0.058" wall, 6063-T832 drawn, no slits $2.35
DXE-AT1489 Aluminum Tubing 6' x 1.625" x 0.058" wall, 6063-T832 drawn, no slits $9.75
DXE-AT1480 Aluminum Tubing 6' x 0.500" x 0.058" wall, 6063-T832 drawn, no slits $4.15
Sub Total: $37.65
i already have four of their 6 ft tubing sections in 1 inch , 1 1/8 inch , 1 1/4 inch and 1 3/8 inch . so ill have enough vertical length to go well beyond the point of the most effective length that folks who tinker with a sigma design have found when modifying them .
this is the second time ive ordered from DXengineering . the first time was a breeze and arrived quickly , the dude said this order should be here thursday .
Aluminum Tubing Type 6063 - 6 ft.
i ordered un-slit sections to save a few bucks . the tubing was $37.65 plus $18.92 shipping , so $56.57 total delivered .
