Try a search on this site and via Google for lensclearance.com, you'll find several threads & posts over the past few months. These should provide enough information to decide how much risk is involved in buying from them.
I stick with well known & reputable stores.
|Douaumont Ossuary by Eric 54-BNF|
from Armistice Day
|Silhouette at sunset by Jill Hancock|
from Portrait Lens (around 80mm or equivalent - please check the full rules)