Luminos 7 mm eyepiece with a 1.25-inch barrel normally $254 (Amazon) - 295 (other stores)
https://au.camelcamelcamel.com/product/B005G3P092
Was looking for upgrade eye pieces. I ordered the 23mm 2" luminos at $200 (instantly jumped to 265) but noticed some of the other luminos on sale are significantly cheaper than other stores.
I'm no expert on these and some mixed reviews about (but they seem to compare to EPs that are double the price). I felt it'll be better than starter EP for 10" dob.
Features & details:
82 degree Field - Wide FOV for high and low magnifications
Retractable eyecups - Ultra-low profile for eyeglass wearers
Parfocal eyepiece - Little or no focusing is needed when changing from low to high power
Threaded barrels - Accept 1.25-inch Celestron thread-in filters
Polished and hard anodized aluminum barrel - Scratch resistant and high end appearance
It's for a telescope (the optical piece you look into) if you got this far and have no idea what's going on still. I suppose there are also binoculars you can put these in.