Looking for a source for 3/8" tubing. Do not care if it is plastic or metal. I went to Ace and aluminum is $8.50 for three feet. I am making loading tubes for my tubular magazine .22. Pre load them before going to the range and then just dump them in. I looked at Mc Master Carr, but am trying to find something cheaper. Need about 20 pieces to hold 6 cartridges each.