I have five lines that I have either never used , or used only infequently , that are for sale. If these don't fill your bill exactly, they would make good practice lines for casting on grass which cuts your lines and eventually ruins them, or for shooting heads.
Rio Double Tapers..$25 each. If you don't need a double taper, these would make two good shooting heads of whatever length you want These are 120' long lines with 15' tapers on both ends, and 1/2 foot tips. I have a 9/10F that I only used for one week salmon fishing in Russia and a 10/11 that is unused and with a loop installed on one end.
Rio Windcutter 8/9/10 I. $25. This is a full intermediate line. If you don't need it, maybe you wouldlike to use a big piece of it as a tip one and tip 2 on a floating Windcutter. Intermediate lines cast better in the wind than floating llines. Great practice line!
Airflow Speycaster floating lines, 8wt slightly use, 9 wt never used. $20 each. This is the predecessor of the new Tradtional. It is described as a double taper with 5' of running line on one end. I believe that they are about 90' long. Again, these would make two good shooting heads each.
Rio Midspey 6/7 with tips. $55. This is the older model with just four tips. Very good shape since I only used it on my 6 and 7 wt rods, which is not very much
If you don't like what you get, return them for a full refund.
Shipping exta at cost