I haven't seen a used set sell for more than $900 for a couple years. I've seen people ask more, but not get it.
Over the last few years, most used sets I've seen actually sell went for $750-$800.
The truth is that they are outdated xenon (not bi-xenon) with diffusing lenses, only marginally better than halogen and nowhere near as bright as bi-xenon headlights.
$500
FS Boxster litronic lights
$795
http://986forum.com/forums/boxster-cayman-parts-sale-wanted/61734-fs-litronic-headlights-pair-$795-shipped.html
$800
https://rennlist.com/forums/parts-marketplace/1044182-fs-986-xenon-headlights.html
$900
Litronic Headlights From 1999 Boxster 69k Miles