Sky Rover SWA 10mm 70 degree eyepiece. Box included.
$30.
Stored in dry box below 50% RH.
5/4 glass construction. Multi-coated.
The Super Wide Angle series (10mm, 15mm, 20mm, 26mm, 32mm, 38mm) is the cheapest of all 70 degree eyepieces, but they are still of decent/usable quality.
SWA is sold under several brands (e.g. Agena). Sky Rover is the house brand for the eyepiece OEM, Tian Hu.
Price is for one eyepiece. I have two for binoviewing, but found the powers too high.