Try looking locally also in your yellow pages of your telephone book.You will be limited with styrene tubing,Plastistruct is the only company that sells it to my knowledge,and the diameters are small,as are the lenghts.They do have a variety of plastic shapes available..it's been a while since I've visited their web page.Acrylic tubing is different,any serious plastics supply house will have extruded&cast lengths of acrylic tubing&rod(also square stock)posibly other shapes,and mostly in 6ft. lenghts.