Selling Tubes.

Over the years I’ve accumulated about 10-15 vintage tubes I no longer need.  I’m wondering if anyone here has found a reliable vendor that will buy excess tubes. I don’t have a tube tester and can’t fairly describe the condition of the tubes, so I can’t seller them here.  The alternative would be to have them tested and then sell them with the test results in hand, but I haven’t seen a tube testing service. Thanks.