Hello I recently purchased the perdix ai, I like the surgical tubing that came with it but I have no idea where I can buy more. I tried to order some of the 3/16 surgical tubing from dive gear express but the kind they sell is a flimsy version not the solid core style that came with it. I found some on simply scuba's website but they will not ship it to the US. Does anyone know where I can order some from?