I have a couple for sale plus other F15T8 lamps.  See For Sale GE F15T8CW Inside Etch and For Sale GE Inside & Outside Etch.  The lamps are only lightly used, but do have a bit of end blackening as a result of being operated on DC RV fixtures.  One has only minimal blackening and while the other is more moderate, the phosphor seems as bright as a new lamp and I don't think they're anywhere near EOL.

For more items, check out my For Sale album.