The tubes Im using right now are from World Wide. They're pretty rigid. Before that I was using those ones with the nice fat rubber grip. I got them through Whitehall but they are available from a lot of supliers. those are fairly soft. almost a hard rubber. Strange that a 3.5 oz. machine could do that. I dont know good guy supply at all. Spearman has supposedly developed a plastic tube that is as close to stainless as anyone has come. They're up on their web site. Im going to try them out at the A.P.T trade show here in Kansas City at the end of this month, but I'll look at Good Guy as well. Thanx Alie